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2193 lines
52 KiB
2193 lines
52 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. |
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*/ |
|
|
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/completion.h> |
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#include <linux/buffer_head.h> |
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#include <linux/namei.h> |
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#include <linux/mm.h> |
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#include <linux/cred.h> |
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#include <linux/xattr.h> |
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#include <linux/posix_acl.h> |
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#include <linux/gfs2_ondisk.h> |
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#include <linux/crc32.h> |
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#include <linux/iomap.h> |
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#include <linux/security.h> |
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#include <linux/fiemap.h> |
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#include <linux/uaccess.h> |
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|
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#include "gfs2.h" |
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#include "incore.h" |
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#include "acl.h" |
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#include "bmap.h" |
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#include "dir.h" |
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#include "xattr.h" |
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#include "glock.h" |
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#include "inode.h" |
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#include "meta_io.h" |
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#include "quota.h" |
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#include "rgrp.h" |
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#include "trans.h" |
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#include "util.h" |
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#include "super.h" |
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#include "glops.h" |
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|
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static const struct inode_operations gfs2_file_iops; |
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static const struct inode_operations gfs2_dir_iops; |
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static const struct inode_operations gfs2_symlink_iops; |
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|
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static int iget_test(struct inode *inode, void *opaque) |
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{ |
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u64 no_addr = *(u64 *)opaque; |
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|
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return GFS2_I(inode)->i_no_addr == no_addr; |
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} |
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|
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static int iget_set(struct inode *inode, void *opaque) |
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{ |
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u64 no_addr = *(u64 *)opaque; |
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|
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GFS2_I(inode)->i_no_addr = no_addr; |
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inode->i_ino = no_addr; |
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return 0; |
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} |
|
|
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static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) |
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{ |
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struct inode *inode; |
|
|
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repeat: |
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inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); |
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if (!inode) |
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return inode; |
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if (is_bad_inode(inode)) { |
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iput(inode); |
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goto repeat; |
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} |
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return inode; |
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} |
|
|
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/** |
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* gfs2_set_iop - Sets inode operations |
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* @inode: The inode with correct i_mode filled in |
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* |
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* GFS2 lookup code fills in vfs inode contents based on info obtained |
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* from directory entry inside gfs2_inode_lookup(). |
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*/ |
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|
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static void gfs2_set_iop(struct inode *inode) |
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{ |
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struct gfs2_sbd *sdp = GFS2_SB(inode); |
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umode_t mode = inode->i_mode; |
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|
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if (S_ISREG(mode)) { |
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inode->i_op = &gfs2_file_iops; |
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if (gfs2_localflocks(sdp)) |
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inode->i_fop = &gfs2_file_fops_nolock; |
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else |
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inode->i_fop = &gfs2_file_fops; |
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} else if (S_ISDIR(mode)) { |
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inode->i_op = &gfs2_dir_iops; |
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if (gfs2_localflocks(sdp)) |
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inode->i_fop = &gfs2_dir_fops_nolock; |
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else |
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inode->i_fop = &gfs2_dir_fops; |
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} else if (S_ISLNK(mode)) { |
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inode->i_op = &gfs2_symlink_iops; |
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} else { |
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inode->i_op = &gfs2_file_iops; |
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init_special_inode(inode, inode->i_mode, inode->i_rdev); |
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} |
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} |
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|
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/** |
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* gfs2_inode_lookup - Lookup an inode |
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* @sb: The super block |
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* @type: The type of the inode |
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* @no_addr: The inode number |
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* @no_formal_ino: The inode generation number |
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* @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; |
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* GFS2_BLKST_FREE to indicate not to verify) |
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* |
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* If @type is DT_UNKNOWN, the inode type is fetched from disk. |
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* |
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* If @blktype is anything other than GFS2_BLKST_FREE (which is used as a |
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* placeholder because it doesn't otherwise make sense), the on-disk block type |
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* is verified to be @blktype. |
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* |
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* When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) |
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* if it detects that @no_formal_ino doesn't match the actual inode generation |
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* number. However, it doesn't always know unless @type is DT_UNKNOWN. |
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* |
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* Returns: A VFS inode, or an error |
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*/ |
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|
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struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, |
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u64 no_addr, u64 no_formal_ino, |
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unsigned int blktype) |
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{ |
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struct inode *inode; |
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struct gfs2_inode *ip; |
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struct gfs2_glock *io_gl = NULL; |
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struct gfs2_holder i_gh; |
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int error; |
|
|
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gfs2_holder_mark_uninitialized(&i_gh); |
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inode = gfs2_iget(sb, no_addr); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
|
|
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ip = GFS2_I(inode); |
|
|
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if (inode->i_state & I_NEW) { |
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struct gfs2_sbd *sdp = GFS2_SB(inode); |
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|
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error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
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if (unlikely(error)) |
|
goto fail; |
|
flush_delayed_work(&ip->i_gl->gl_work); |
|
|
|
error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
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if (unlikely(error)) |
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goto fail; |
|
if (blktype != GFS2_BLKST_UNLINKED) |
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gfs2_cancel_delete_work(io_gl); |
|
|
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if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { |
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/* |
|
* The GL_SKIP flag indicates to skip reading the inode |
|
* block. We read the inode with gfs2_inode_refresh |
|
* after possibly checking the block type. |
|
*/ |
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, |
|
GL_SKIP, &i_gh); |
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if (error) |
|
goto fail; |
|
|
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error = -ESTALE; |
|
if (no_formal_ino && |
|
gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) |
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goto fail; |
|
|
|
if (blktype != GFS2_BLKST_FREE) { |
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error = gfs2_check_blk_type(sdp, no_addr, |
|
blktype); |
|
if (error) |
|
goto fail; |
|
} |
|
} |
|
|
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glock_set_object(ip->i_gl, ip); |
|
set_bit(GIF_INVALID, &ip->i_flags); |
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error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
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if (unlikely(error)) |
|
goto fail; |
|
glock_set_object(ip->i_iopen_gh.gh_gl, ip); |
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gfs2_glock_put(io_gl); |
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io_gl = NULL; |
|
|
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/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ |
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inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); |
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inode->i_atime.tv_nsec = 0; |
|
|
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if (type == DT_UNKNOWN) { |
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/* Inode glock must be locked already */ |
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error = gfs2_inode_refresh(GFS2_I(inode)); |
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if (error) |
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goto fail; |
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} else { |
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ip->i_no_formal_ino = no_formal_ino; |
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inode->i_mode = DT2IF(type); |
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} |
|
|
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if (gfs2_holder_initialized(&i_gh)) |
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gfs2_glock_dq_uninit(&i_gh); |
|
|
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gfs2_set_iop(inode); |
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} |
|
|
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if (no_formal_ino && ip->i_no_formal_ino && |
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no_formal_ino != ip->i_no_formal_ino) { |
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error = -ESTALE; |
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if (inode->i_state & I_NEW) |
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goto fail; |
|
iput(inode); |
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return ERR_PTR(error); |
|
} |
|
|
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if (inode->i_state & I_NEW) |
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unlock_new_inode(inode); |
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|
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return inode; |
|
|
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fail: |
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if (io_gl) |
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gfs2_glock_put(io_gl); |
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if (gfs2_holder_initialized(&i_gh)) |
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gfs2_glock_dq_uninit(&i_gh); |
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iget_failed(inode); |
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return ERR_PTR(error); |
|
} |
|
|
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/** |
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* gfs2_lookup_by_inum - look up an inode by inode number |
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* @sdp: The super block |
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* @no_addr: The inode number |
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* @no_formal_ino: The inode generation number (0 for any) |
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* @blktype: Requested block type (see gfs2_inode_lookup) |
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*/ |
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struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, |
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u64 no_formal_ino, unsigned int blktype) |
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{ |
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struct super_block *sb = sdp->sd_vfs; |
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struct inode *inode; |
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int error; |
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|
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inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, |
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blktype); |
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if (IS_ERR(inode)) |
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return inode; |
|
|
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if (no_formal_ino) { |
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error = -EIO; |
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if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) |
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goto fail_iput; |
|
} |
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return inode; |
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|
|
fail_iput: |
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iput(inode); |
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return ERR_PTR(error); |
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} |
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|
|
|
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struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
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{ |
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struct qstr qstr; |
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struct inode *inode; |
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gfs2_str2qstr(&qstr, name); |
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inode = gfs2_lookupi(dip, &qstr, 1); |
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/* gfs2_lookupi has inconsistent callers: vfs |
|
* related routines expect NULL for no entry found, |
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* gfs2_lookup_simple callers expect ENOENT |
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* and do not check for NULL. |
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*/ |
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if (inode == NULL) |
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return ERR_PTR(-ENOENT); |
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else |
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return inode; |
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} |
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|
|
|
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/** |
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* gfs2_lookupi - Look up a filename in a directory and return its inode |
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* @dir: The inode of the directory containing the inode to look-up |
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* @name: The name of the inode to look for |
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* @is_root: If 1, ignore the caller's permissions |
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* |
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* This can be called via the VFS filldir function when NFS is doing |
|
* a readdirplus and the inode which its intending to stat isn't |
|
* already in cache. In this case we must not take the directory glock |
|
* again, since the readdir call will have already taken that lock. |
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* |
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* Returns: errno |
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*/ |
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|
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struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
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int is_root) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct gfs2_inode *dip = GFS2_I(dir); |
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struct gfs2_holder d_gh; |
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int error = 0; |
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struct inode *inode = NULL; |
|
|
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gfs2_holder_mark_uninitialized(&d_gh); |
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if (!name->len || name->len > GFS2_FNAMESIZE) |
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return ERR_PTR(-ENAMETOOLONG); |
|
|
|
if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
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(name->len == 2 && memcmp(name->name, "..", 2) == 0 && |
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dir == d_inode(sb->s_root))) { |
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igrab(dir); |
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return dir; |
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} |
|
|
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if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { |
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
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if (error) |
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return ERR_PTR(error); |
|
} |
|
|
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if (!is_root) { |
|
error = gfs2_permission(&init_user_ns, dir, MAY_EXEC); |
|
if (error) |
|
goto out; |
|
} |
|
|
|
inode = gfs2_dir_search(dir, name, false); |
|
if (IS_ERR(inode)) |
|
error = PTR_ERR(inode); |
|
out: |
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if (gfs2_holder_initialized(&d_gh)) |
|
gfs2_glock_dq_uninit(&d_gh); |
|
if (error == -ENOENT) |
|
return NULL; |
|
return inode ? inode : ERR_PTR(error); |
|
} |
|
|
|
/** |
|
* create_ok - OK to create a new on-disk inode here? |
|
* @dip: Directory in which dinode is to be created |
|
* @name: Name of new dinode |
|
* @mode: |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
|
umode_t mode) |
|
{ |
|
int error; |
|
|
|
error = gfs2_permission(&init_user_ns, &dip->i_inode, |
|
MAY_WRITE | MAY_EXEC); |
|
if (error) |
|
return error; |
|
|
|
/* Don't create entries in an unlinked directory */ |
|
if (!dip->i_inode.i_nlink) |
|
return -ENOENT; |
|
|
|
if (dip->i_entries == (u32)-1) |
|
return -EFBIG; |
|
if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
|
return -EMLINK; |
|
|
|
return 0; |
|
} |
|
|
|
static void munge_mode_uid_gid(const struct gfs2_inode *dip, |
|
struct inode *inode) |
|
{ |
|
if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
|
(dip->i_inode.i_mode & S_ISUID) && |
|
!uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { |
|
if (S_ISDIR(inode->i_mode)) |
|
inode->i_mode |= S_ISUID; |
|
else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) |
|
inode->i_mode &= ~07111; |
|
inode->i_uid = dip->i_inode.i_uid; |
|
} else |
|
inode->i_uid = current_fsuid(); |
|
|
|
if (dip->i_inode.i_mode & S_ISGID) { |
|
if (S_ISDIR(inode->i_mode)) |
|
inode->i_mode |= S_ISGID; |
|
inode->i_gid = dip->i_inode.i_gid; |
|
} else |
|
inode->i_gid = current_fsgid(); |
|
} |
|
|
|
static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) |
|
{ |
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
|
struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; |
|
int error; |
|
|
|
error = gfs2_quota_lock_check(ip, &ap); |
|
if (error) |
|
goto out; |
|
|
|
error = gfs2_inplace_reserve(ip, &ap); |
|
if (error) |
|
goto out_quota; |
|
|
|
error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); |
|
if (error) |
|
goto out_ipreserv; |
|
|
|
error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); |
|
ip->i_no_formal_ino = ip->i_generation; |
|
ip->i_inode.i_ino = ip->i_no_addr; |
|
ip->i_goal = ip->i_no_addr; |
|
|
|
gfs2_trans_end(sdp); |
|
|
|
out_ipreserv: |
|
gfs2_inplace_release(ip); |
|
out_quota: |
|
gfs2_quota_unlock(ip); |
|
out: |
|
return error; |
|
} |
|
|
|
static void gfs2_init_dir(struct buffer_head *dibh, |
|
const struct gfs2_inode *parent) |
|
{ |
|
struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; |
|
struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); |
|
|
|
gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); |
|
dent->de_inum = di->di_num; /* already GFS2 endian */ |
|
dent->de_type = cpu_to_be16(DT_DIR); |
|
|
|
dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); |
|
gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); |
|
gfs2_inum_out(parent, dent); |
|
dent->de_type = cpu_to_be16(DT_DIR); |
|
|
|
} |
|
|
|
/** |
|
* gfs2_init_xattr - Initialise an xattr block for a new inode |
|
* @ip: The inode in question |
|
* |
|
* This sets up an empty xattr block for a new inode, ready to |
|
* take any ACLs, LSM xattrs, etc. |
|
*/ |
|
|
|
static void gfs2_init_xattr(struct gfs2_inode *ip) |
|
{ |
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
|
struct buffer_head *bh; |
|
struct gfs2_ea_header *ea; |
|
|
|
bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); |
|
gfs2_trans_add_meta(ip->i_gl, bh); |
|
gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); |
|
gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); |
|
|
|
ea = GFS2_EA_BH2FIRST(bh); |
|
ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); |
|
ea->ea_type = GFS2_EATYPE_UNUSED; |
|
ea->ea_flags = GFS2_EAFLAG_LAST; |
|
|
|
brelse(bh); |
|
} |
|
|
|
/** |
|
* init_dinode - Fill in a new dinode structure |
|
* @dip: The directory this inode is being created in |
|
* @ip: The inode |
|
* @symname: The symlink destination (if a symlink) |
|
* |
|
*/ |
|
|
|
static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, |
|
const char *symname) |
|
{ |
|
struct gfs2_dinode *di; |
|
struct buffer_head *dibh; |
|
|
|
dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); |
|
gfs2_trans_add_meta(ip->i_gl, dibh); |
|
di = (struct gfs2_dinode *)dibh->b_data; |
|
gfs2_dinode_out(ip, di); |
|
|
|
di->di_major = cpu_to_be32(imajor(&ip->i_inode)); |
|
di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); |
|
di->__pad1 = 0; |
|
di->__pad2 = 0; |
|
di->__pad3 = 0; |
|
memset(&di->__pad4, 0, sizeof(di->__pad4)); |
|
memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
|
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
|
|
|
switch(ip->i_inode.i_mode & S_IFMT) { |
|
case S_IFDIR: |
|
gfs2_init_dir(dibh, dip); |
|
break; |
|
case S_IFLNK: |
|
memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); |
|
break; |
|
} |
|
|
|
set_buffer_uptodate(dibh); |
|
brelse(dibh); |
|
} |
|
|
|
/** |
|
* gfs2_trans_da_blks - Calculate number of blocks to link inode |
|
* @dip: The directory we are linking into |
|
* @da: The dir add information |
|
* @nr_inodes: The number of inodes involved |
|
* |
|
* This calculate the number of blocks we need to reserve in a |
|
* transaction to link @nr_inodes into a directory. In most cases |
|
* @nr_inodes will be 2 (the directory plus the inode being linked in) |
|
* but in case of rename, 4 may be required. |
|
* |
|
* Returns: Number of blocks |
|
*/ |
|
|
|
static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, |
|
const struct gfs2_diradd *da, |
|
unsigned nr_inodes) |
|
{ |
|
return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + |
|
(nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; |
|
} |
|
|
|
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
|
struct gfs2_inode *ip, struct gfs2_diradd *da) |
|
{ |
|
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
|
struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; |
|
int error; |
|
|
|
if (da->nr_blocks) { |
|
error = gfs2_quota_lock_check(dip, &ap); |
|
if (error) |
|
goto fail_quota_locks; |
|
|
|
error = gfs2_inplace_reserve(dip, &ap); |
|
if (error) |
|
goto fail_quota_locks; |
|
|
|
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); |
|
if (error) |
|
goto fail_ipreserv; |
|
} else { |
|
error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
|
if (error) |
|
goto fail_quota_locks; |
|
} |
|
|
|
error = gfs2_dir_add(&dip->i_inode, name, ip, da); |
|
|
|
gfs2_trans_end(sdp); |
|
fail_ipreserv: |
|
gfs2_inplace_release(dip); |
|
fail_quota_locks: |
|
gfs2_quota_unlock(dip); |
|
return error; |
|
} |
|
|
|
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
|
void *fs_info) |
|
{ |
|
const struct xattr *xattr; |
|
int err = 0; |
|
|
|
for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
|
err = __gfs2_xattr_set(inode, xattr->name, xattr->value, |
|
xattr->value_len, 0, |
|
GFS2_EATYPE_SECURITY); |
|
if (err < 0) |
|
break; |
|
} |
|
return err; |
|
} |
|
|
|
/** |
|
* gfs2_create_inode - Create a new inode |
|
* @dir: The parent directory |
|
* @dentry: The new dentry |
|
* @file: If non-NULL, the file which is being opened |
|
* @mode: The permissions on the new inode |
|
* @dev: For device nodes, this is the device number |
|
* @symname: For symlinks, this is the link destination |
|
* @size: The initial size of the inode (ignored for directories) |
|
* @excl: Force fail if inode exists |
|
* |
|
* Returns: 0 on success, or error code |
|
*/ |
|
|
|
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, |
|
struct file *file, |
|
umode_t mode, dev_t dev, const char *symname, |
|
unsigned int size, int excl) |
|
{ |
|
const struct qstr *name = &dentry->d_name; |
|
struct posix_acl *default_acl, *acl; |
|
struct gfs2_holder ghs[2]; |
|
struct inode *inode = NULL; |
|
struct gfs2_inode *dip = GFS2_I(dir), *ip; |
|
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
|
struct gfs2_glock *io_gl; |
|
int error, free_vfs_inode = 1; |
|
u32 aflags = 0; |
|
unsigned blocks = 1; |
|
struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; |
|
|
|
if (!name->len || name->len > GFS2_FNAMESIZE) |
|
return -ENAMETOOLONG; |
|
|
|
error = gfs2_qa_get(dip); |
|
if (error) |
|
return error; |
|
|
|
error = gfs2_rindex_update(sdp); |
|
if (error) |
|
goto fail; |
|
|
|
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
|
if (error) |
|
goto fail; |
|
gfs2_holder_mark_uninitialized(ghs + 1); |
|
|
|
error = create_ok(dip, name, mode); |
|
if (error) |
|
goto fail_gunlock; |
|
|
|
inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); |
|
error = PTR_ERR(inode); |
|
if (!IS_ERR(inode)) { |
|
if (S_ISDIR(inode->i_mode)) { |
|
iput(inode); |
|
inode = ERR_PTR(-EISDIR); |
|
goto fail_gunlock; |
|
} |
|
d_instantiate(dentry, inode); |
|
error = 0; |
|
if (file) { |
|
if (S_ISREG(inode->i_mode)) |
|
error = finish_open(file, dentry, gfs2_open_common); |
|
else |
|
error = finish_no_open(file, NULL); |
|
} |
|
gfs2_glock_dq_uninit(ghs); |
|
goto fail; |
|
} else if (error != -ENOENT) { |
|
goto fail_gunlock; |
|
} |
|
|
|
error = gfs2_diradd_alloc_required(dir, name, &da); |
|
if (error < 0) |
|
goto fail_gunlock; |
|
|
|
inode = new_inode(sdp->sd_vfs); |
|
error = -ENOMEM; |
|
if (!inode) |
|
goto fail_gunlock; |
|
|
|
error = posix_acl_create(dir, &mode, &default_acl, &acl); |
|
if (error) |
|
goto fail_gunlock; |
|
|
|
ip = GFS2_I(inode); |
|
error = gfs2_qa_get(ip); |
|
if (error) |
|
goto fail_free_acls; |
|
|
|
inode->i_mode = mode; |
|
set_nlink(inode, S_ISDIR(mode) ? 2 : 1); |
|
inode->i_rdev = dev; |
|
inode->i_size = size; |
|
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
|
munge_mode_uid_gid(dip, inode); |
|
check_and_update_goal(dip); |
|
ip->i_goal = dip->i_goal; |
|
ip->i_diskflags = 0; |
|
ip->i_eattr = 0; |
|
ip->i_height = 0; |
|
ip->i_depth = 0; |
|
ip->i_entries = 0; |
|
ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ |
|
|
|
switch(mode & S_IFMT) { |
|
case S_IFREG: |
|
if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || |
|
gfs2_tune_get(sdp, gt_new_files_jdata)) |
|
ip->i_diskflags |= GFS2_DIF_JDATA; |
|
gfs2_set_aops(inode); |
|
break; |
|
case S_IFDIR: |
|
ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); |
|
ip->i_diskflags |= GFS2_DIF_JDATA; |
|
ip->i_entries = 2; |
|
break; |
|
} |
|
|
|
/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ |
|
if (dip->i_diskflags & GFS2_DIF_SYSTEM) |
|
ip->i_diskflags |= GFS2_DIF_SYSTEM; |
|
|
|
gfs2_set_inode_flags(inode); |
|
|
|
if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || |
|
(dip->i_diskflags & GFS2_DIF_TOPDIR)) |
|
aflags |= GFS2_AF_ORLOV; |
|
|
|
if (default_acl || acl) |
|
blocks++; |
|
|
|
error = alloc_dinode(ip, aflags, &blocks); |
|
if (error) |
|
goto fail_free_inode; |
|
|
|
gfs2_set_inode_blocks(inode, blocks); |
|
|
|
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
|
if (error) |
|
goto fail_free_inode; |
|
flush_delayed_work(&ip->i_gl->gl_work); |
|
glock_set_object(ip->i_gl, ip); |
|
|
|
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
|
if (error) |
|
goto fail_free_inode; |
|
gfs2_cancel_delete_work(io_gl); |
|
glock_set_object(io_gl, ip); |
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
|
if (error) |
|
goto fail_gunlock2; |
|
|
|
error = gfs2_trans_begin(sdp, blocks, 0); |
|
if (error) |
|
goto fail_gunlock2; |
|
|
|
if (blocks > 1) { |
|
ip->i_eattr = ip->i_no_addr + 1; |
|
gfs2_init_xattr(ip); |
|
} |
|
init_dinode(dip, ip, symname); |
|
gfs2_trans_end(sdp); |
|
|
|
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
|
if (error) |
|
goto fail_gunlock2; |
|
|
|
gfs2_set_iop(inode); |
|
insert_inode_hash(inode); |
|
|
|
free_vfs_inode = 0; /* After this point, the inode is no longer |
|
considered free. Any failures need to undo |
|
the gfs2 structures. */ |
|
if (default_acl) { |
|
error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); |
|
if (error) |
|
goto fail_gunlock3; |
|
posix_acl_release(default_acl); |
|
default_acl = NULL; |
|
} |
|
if (acl) { |
|
error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); |
|
if (error) |
|
goto fail_gunlock3; |
|
posix_acl_release(acl); |
|
acl = NULL; |
|
} |
|
|
|
error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, |
|
&gfs2_initxattrs, NULL); |
|
if (error) |
|
goto fail_gunlock3; |
|
|
|
error = link_dinode(dip, name, ip, &da); |
|
if (error) |
|
goto fail_gunlock3; |
|
|
|
mark_inode_dirty(inode); |
|
d_instantiate(dentry, inode); |
|
/* After instantiate, errors should result in evict which will destroy |
|
* both inode and iopen glocks properly. */ |
|
if (file) { |
|
file->f_mode |= FMODE_CREATED; |
|
error = finish_open(file, dentry, gfs2_open_common); |
|
} |
|
gfs2_glock_dq_uninit(ghs); |
|
gfs2_qa_put(ip); |
|
gfs2_glock_dq_uninit(ghs + 1); |
|
gfs2_glock_put(io_gl); |
|
gfs2_qa_put(dip); |
|
return error; |
|
|
|
fail_gunlock3: |
|
glock_clear_object(io_gl, ip); |
|
gfs2_glock_dq_uninit(&ip->i_iopen_gh); |
|
fail_gunlock2: |
|
glock_clear_object(io_gl, ip); |
|
gfs2_glock_put(io_gl); |
|
fail_free_inode: |
|
if (ip->i_gl) { |
|
glock_clear_object(ip->i_gl, ip); |
|
if (free_vfs_inode) /* else evict will do the put for us */ |
|
gfs2_glock_put(ip->i_gl); |
|
} |
|
gfs2_rs_delete(ip, NULL); |
|
gfs2_qa_put(ip); |
|
fail_free_acls: |
|
posix_acl_release(default_acl); |
|
posix_acl_release(acl); |
|
fail_gunlock: |
|
gfs2_dir_no_add(&da); |
|
gfs2_glock_dq_uninit(ghs); |
|
if (!IS_ERR_OR_NULL(inode)) { |
|
clear_nlink(inode); |
|
if (!free_vfs_inode) |
|
mark_inode_dirty(inode); |
|
set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, |
|
&GFS2_I(inode)->i_flags); |
|
iput(inode); |
|
} |
|
if (gfs2_holder_initialized(ghs + 1)) |
|
gfs2_glock_dq_uninit(ghs + 1); |
|
fail: |
|
gfs2_qa_put(dip); |
|
return error; |
|
} |
|
|
|
/** |
|
* gfs2_create - Create a file |
|
* @mnt_userns: User namespace of the mount the inode was found from |
|
* @dir: The directory in which to create the file |
|
* @dentry: The dentry of the new file |
|
* @mode: The mode of the new file |
|
* @excl: Force fail if inode exists |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode, bool excl) |
|
{ |
|
return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); |
|
} |
|
|
|
/** |
|
* __gfs2_lookup - Look up a filename in a directory and return its inode |
|
* @dir: The directory inode |
|
* @dentry: The dentry of the new inode |
|
* @file: File to be opened |
|
* |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, |
|
struct file *file) |
|
{ |
|
struct inode *inode; |
|
struct dentry *d; |
|
struct gfs2_holder gh; |
|
struct gfs2_glock *gl; |
|
int error; |
|
|
|
inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
|
if (inode == NULL) { |
|
d_add(dentry, NULL); |
|
return NULL; |
|
} |
|
if (IS_ERR(inode)) |
|
return ERR_CAST(inode); |
|
|
|
gl = GFS2_I(inode)->i_gl; |
|
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
|
if (error) { |
|
iput(inode); |
|
return ERR_PTR(error); |
|
} |
|
|
|
d = d_splice_alias(inode, dentry); |
|
if (IS_ERR(d)) { |
|
gfs2_glock_dq_uninit(&gh); |
|
return d; |
|
} |
|
if (file && S_ISREG(inode->i_mode)) |
|
error = finish_open(file, dentry, gfs2_open_common); |
|
|
|
gfs2_glock_dq_uninit(&gh); |
|
if (error) { |
|
dput(d); |
|
return ERR_PTR(error); |
|
} |
|
return d; |
|
} |
|
|
|
static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, |
|
unsigned flags) |
|
{ |
|
return __gfs2_lookup(dir, dentry, NULL); |
|
} |
|
|
|
/** |
|
* gfs2_link - Link to a file |
|
* @old_dentry: The inode to link |
|
* @dir: Add link to this directory |
|
* @dentry: The name of the link |
|
* |
|
* Link the inode in "old_dentry" into the directory "dir" with the |
|
* name in "dentry". |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_link(struct dentry *old_dentry, struct inode *dir, |
|
struct dentry *dentry) |
|
{ |
|
struct gfs2_inode *dip = GFS2_I(dir); |
|
struct gfs2_sbd *sdp = GFS2_SB(dir); |
|
struct inode *inode = d_inode(old_dentry); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder ghs[2]; |
|
struct buffer_head *dibh; |
|
struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; |
|
int error; |
|
|
|
if (S_ISDIR(inode->i_mode)) |
|
return -EPERM; |
|
|
|
error = gfs2_qa_get(dip); |
|
if (error) |
|
return error; |
|
|
|
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
|
|
|
error = gfs2_glock_nq(ghs); /* parent */ |
|
if (error) |
|
goto out_parent; |
|
|
|
error = gfs2_glock_nq(ghs + 1); /* child */ |
|
if (error) |
|
goto out_child; |
|
|
|
error = -ENOENT; |
|
if (inode->i_nlink == 0) |
|
goto out_gunlock; |
|
|
|
error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
|
switch (error) { |
|
case -ENOENT: |
|
break; |
|
case 0: |
|
error = -EEXIST; |
|
goto out_gunlock; |
|
default: |
|
goto out_gunlock; |
|
} |
|
|
|
error = -EINVAL; |
|
if (!dip->i_inode.i_nlink) |
|
goto out_gunlock; |
|
error = -EFBIG; |
|
if (dip->i_entries == (u32)-1) |
|
goto out_gunlock; |
|
error = -EPERM; |
|
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) |
|
goto out_gunlock; |
|
error = -EINVAL; |
|
if (!ip->i_inode.i_nlink) |
|
goto out_gunlock; |
|
error = -EMLINK; |
|
if (ip->i_inode.i_nlink == (u32)-1) |
|
goto out_gunlock; |
|
|
|
error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); |
|
if (error < 0) |
|
goto out_gunlock; |
|
|
|
if (da.nr_blocks) { |
|
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; |
|
error = gfs2_quota_lock_check(dip, &ap); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = gfs2_inplace_reserve(dip, &ap); |
|
if (error) |
|
goto out_gunlock_q; |
|
|
|
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); |
|
if (error) |
|
goto out_ipres; |
|
} else { |
|
error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); |
|
if (error) |
|
goto out_ipres; |
|
} |
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); |
|
if (error) |
|
goto out_brelse; |
|
|
|
gfs2_trans_add_meta(ip->i_gl, dibh); |
|
inc_nlink(&ip->i_inode); |
|
ip->i_inode.i_ctime = current_time(&ip->i_inode); |
|
ihold(inode); |
|
d_instantiate(dentry, inode); |
|
mark_inode_dirty(inode); |
|
|
|
out_brelse: |
|
brelse(dibh); |
|
out_end_trans: |
|
gfs2_trans_end(sdp); |
|
out_ipres: |
|
if (da.nr_blocks) |
|
gfs2_inplace_release(dip); |
|
out_gunlock_q: |
|
if (da.nr_blocks) |
|
gfs2_quota_unlock(dip); |
|
out_gunlock: |
|
gfs2_dir_no_add(&da); |
|
gfs2_glock_dq(ghs + 1); |
|
out_child: |
|
gfs2_glock_dq(ghs); |
|
out_parent: |
|
gfs2_qa_put(dip); |
|
gfs2_holder_uninit(ghs); |
|
gfs2_holder_uninit(ghs + 1); |
|
return error; |
|
} |
|
|
|
/* |
|
* gfs2_unlink_ok - check to see that a inode is still in a directory |
|
* @dip: the directory |
|
* @name: the name of the file |
|
* @ip: the inode |
|
* |
|
* Assumes that the lock on (at least) @dip is held. |
|
* |
|
* Returns: 0 if the parent/child relationship is correct, errno if it isn't |
|
*/ |
|
|
|
static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
|
const struct gfs2_inode *ip) |
|
{ |
|
int error; |
|
|
|
if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
|
return -EPERM; |
|
|
|
if ((dip->i_inode.i_mode & S_ISVTX) && |
|
!uid_eq(dip->i_inode.i_uid, current_fsuid()) && |
|
!uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) |
|
return -EPERM; |
|
|
|
if (IS_APPEND(&dip->i_inode)) |
|
return -EPERM; |
|
|
|
error = gfs2_permission(&init_user_ns, &dip->i_inode, |
|
MAY_WRITE | MAY_EXEC); |
|
if (error) |
|
return error; |
|
|
|
return gfs2_dir_check(&dip->i_inode, name, ip); |
|
} |
|
|
|
/** |
|
* gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
|
* @dip: The parent directory |
|
* @dentry: The dentry to unlink |
|
* |
|
* Called with all the locks and in a transaction. This will only be |
|
* called for a directory after it has been checked to ensure it is empty. |
|
* |
|
* Returns: 0 on success, or an error |
|
*/ |
|
|
|
static int gfs2_unlink_inode(struct gfs2_inode *dip, |
|
const struct dentry *dentry) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
int error; |
|
|
|
error = gfs2_dir_del(dip, dentry); |
|
if (error) |
|
return error; |
|
|
|
ip->i_entries = 0; |
|
inode->i_ctime = current_time(inode); |
|
if (S_ISDIR(inode->i_mode)) |
|
clear_nlink(inode); |
|
else |
|
drop_nlink(inode); |
|
mark_inode_dirty(inode); |
|
if (inode->i_nlink == 0) |
|
gfs2_unlink_di(inode); |
|
return 0; |
|
} |
|
|
|
|
|
/** |
|
* gfs2_unlink - Unlink an inode (this does rmdir as well) |
|
* @dir: The inode of the directory containing the inode to unlink |
|
* @dentry: The file itself |
|
* |
|
* This routine uses the type of the inode as a flag to figure out |
|
* whether this is an unlink or an rmdir. |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_unlink(struct inode *dir, struct dentry *dentry) |
|
{ |
|
struct gfs2_inode *dip = GFS2_I(dir); |
|
struct gfs2_sbd *sdp = GFS2_SB(dir); |
|
struct inode *inode = d_inode(dentry); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder ghs[3]; |
|
struct gfs2_rgrpd *rgd; |
|
int error; |
|
|
|
error = gfs2_rindex_update(sdp); |
|
if (error) |
|
return error; |
|
|
|
error = -EROFS; |
|
|
|
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
|
|
|
rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); |
|
if (!rgd) |
|
goto out_inodes; |
|
|
|
gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2); |
|
|
|
|
|
error = gfs2_glock_nq(ghs); /* parent */ |
|
if (error) |
|
goto out_parent; |
|
|
|
error = gfs2_glock_nq(ghs + 1); /* child */ |
|
if (error) |
|
goto out_child; |
|
|
|
error = -ENOENT; |
|
if (inode->i_nlink == 0) |
|
goto out_rgrp; |
|
|
|
if (S_ISDIR(inode->i_mode)) { |
|
error = -ENOTEMPTY; |
|
if (ip->i_entries > 2 || inode->i_nlink > 2) |
|
goto out_rgrp; |
|
} |
|
|
|
error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
|
if (error) |
|
goto out_rgrp; |
|
|
|
error = gfs2_unlink_ok(dip, &dentry->d_name, ip); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = gfs2_unlink_inode(dip, dentry); |
|
gfs2_trans_end(sdp); |
|
|
|
out_gunlock: |
|
gfs2_glock_dq(ghs + 2); |
|
out_rgrp: |
|
gfs2_glock_dq(ghs + 1); |
|
out_child: |
|
gfs2_glock_dq(ghs); |
|
out_parent: |
|
gfs2_holder_uninit(ghs + 2); |
|
out_inodes: |
|
gfs2_holder_uninit(ghs + 1); |
|
gfs2_holder_uninit(ghs); |
|
return error; |
|
} |
|
|
|
/** |
|
* gfs2_symlink - Create a symlink |
|
* @mnt_userns: User namespace of the mount the inode was found from |
|
* @dir: The directory to create the symlink in |
|
* @dentry: The dentry to put the symlink in |
|
* @symname: The thing which the link points to |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, const char *symname) |
|
{ |
|
unsigned int size; |
|
|
|
size = strlen(symname); |
|
if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) |
|
return -ENAMETOOLONG; |
|
|
|
return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); |
|
} |
|
|
|
/** |
|
* gfs2_mkdir - Make a directory |
|
* @mnt_userns: User namespace of the mount the inode was found from |
|
* @dir: The parent directory of the new one |
|
* @dentry: The dentry of the new directory |
|
* @mode: The mode of the new directory |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode) |
|
{ |
|
unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); |
|
return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); |
|
} |
|
|
|
/** |
|
* gfs2_mknod - Make a special file |
|
* @mnt_userns: User namespace of the mount the inode was found from |
|
* @dir: The directory in which the special file will reside |
|
* @dentry: The dentry of the special file |
|
* @mode: The mode of the special file |
|
* @dev: The device specification of the special file |
|
* |
|
*/ |
|
|
|
static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode, dev_t dev) |
|
{ |
|
return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); |
|
} |
|
|
|
/** |
|
* gfs2_atomic_open - Atomically open a file |
|
* @dir: The directory |
|
* @dentry: The proposed new entry |
|
* @file: The proposed new struct file |
|
* @flags: open flags |
|
* @mode: File mode |
|
* |
|
* Returns: error code or 0 for success |
|
*/ |
|
|
|
static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, |
|
struct file *file, unsigned flags, |
|
umode_t mode) |
|
{ |
|
struct dentry *d; |
|
bool excl = !!(flags & O_EXCL); |
|
|
|
if (!d_in_lookup(dentry)) |
|
goto skip_lookup; |
|
|
|
d = __gfs2_lookup(dir, dentry, file); |
|
if (IS_ERR(d)) |
|
return PTR_ERR(d); |
|
if (d != NULL) |
|
dentry = d; |
|
if (d_really_is_positive(dentry)) { |
|
if (!(file->f_mode & FMODE_OPENED)) |
|
return finish_no_open(file, d); |
|
dput(d); |
|
return excl && (flags & O_CREAT) ? -EEXIST : 0; |
|
} |
|
|
|
BUG_ON(d != NULL); |
|
|
|
skip_lookup: |
|
if (!(flags & O_CREAT)) |
|
return -ENOENT; |
|
|
|
return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); |
|
} |
|
|
|
/* |
|
* gfs2_ok_to_move - check if it's ok to move a directory to another directory |
|
* @this: move this |
|
* @to: to here |
|
* |
|
* Follow @to back to the root and make sure we don't encounter @this |
|
* Assumes we already hold the rename lock. |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) |
|
{ |
|
struct inode *dir = &to->i_inode; |
|
struct super_block *sb = dir->i_sb; |
|
struct inode *tmp; |
|
int error = 0; |
|
|
|
igrab(dir); |
|
|
|
for (;;) { |
|
if (dir == &this->i_inode) { |
|
error = -EINVAL; |
|
break; |
|
} |
|
if (dir == d_inode(sb->s_root)) { |
|
error = 0; |
|
break; |
|
} |
|
|
|
tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
|
if (!tmp) { |
|
error = -ENOENT; |
|
break; |
|
} |
|
if (IS_ERR(tmp)) { |
|
error = PTR_ERR(tmp); |
|
break; |
|
} |
|
|
|
iput(dir); |
|
dir = tmp; |
|
} |
|
|
|
iput(dir); |
|
|
|
return error; |
|
} |
|
|
|
/** |
|
* update_moved_ino - Update an inode that's being moved |
|
* @ip: The inode being moved |
|
* @ndip: The parent directory of the new filename |
|
* @dir_rename: True of ip is a directory |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, |
|
int dir_rename) |
|
{ |
|
if (dir_rename) |
|
return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
|
|
|
ip->i_inode.i_ctime = current_time(&ip->i_inode); |
|
mark_inode_dirty_sync(&ip->i_inode); |
|
return 0; |
|
} |
|
|
|
|
|
/** |
|
* gfs2_rename - Rename a file |
|
* @odir: Parent directory of old file name |
|
* @odentry: The old dentry of the file |
|
* @ndir: Parent directory of new file name |
|
* @ndentry: The new dentry of the file |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_rename(struct inode *odir, struct dentry *odentry, |
|
struct inode *ndir, struct dentry *ndentry) |
|
{ |
|
struct gfs2_inode *odip = GFS2_I(odir); |
|
struct gfs2_inode *ndip = GFS2_I(ndir); |
|
struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); |
|
struct gfs2_inode *nip = NULL; |
|
struct gfs2_sbd *sdp = GFS2_SB(odir); |
|
struct gfs2_holder ghs[4], r_gh, rd_gh; |
|
struct gfs2_rgrpd *nrgd; |
|
unsigned int num_gh; |
|
int dir_rename = 0; |
|
struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; |
|
unsigned int x; |
|
int error; |
|
|
|
gfs2_holder_mark_uninitialized(&r_gh); |
|
gfs2_holder_mark_uninitialized(&rd_gh); |
|
if (d_really_is_positive(ndentry)) { |
|
nip = GFS2_I(d_inode(ndentry)); |
|
if (ip == nip) |
|
return 0; |
|
} |
|
|
|
error = gfs2_rindex_update(sdp); |
|
if (error) |
|
return error; |
|
|
|
error = gfs2_qa_get(ndip); |
|
if (error) |
|
return error; |
|
|
|
if (odip != ndip) { |
|
error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, |
|
0, &r_gh); |
|
if (error) |
|
goto out; |
|
|
|
if (S_ISDIR(ip->i_inode.i_mode)) { |
|
dir_rename = 1; |
|
/* don't move a directory into its subdir */ |
|
error = gfs2_ok_to_move(ip, ndip); |
|
if (error) |
|
goto out_gunlock_r; |
|
} |
|
} |
|
|
|
num_gh = 1; |
|
gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); |
|
if (odip != ndip) { |
|
gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, |
|
ghs + num_gh); |
|
num_gh++; |
|
} |
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); |
|
num_gh++; |
|
|
|
if (nip) { |
|
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, |
|
ghs + num_gh); |
|
num_gh++; |
|
} |
|
|
|
for (x = 0; x < num_gh; x++) { |
|
error = gfs2_glock_nq(ghs + x); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
error = gfs2_glock_async_wait(num_gh, ghs); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
if (nip) { |
|
/* Grab the resource group glock for unlink flag twiddling. |
|
* This is the case where the target dinode already exists |
|
* so we unlink before doing the rename. |
|
*/ |
|
nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); |
|
if (!nrgd) { |
|
error = -ENOENT; |
|
goto out_gunlock; |
|
} |
|
error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, |
|
LM_FLAG_NODE_SCOPE, &rd_gh); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
|
|
error = -ENOENT; |
|
if (ip->i_inode.i_nlink == 0) |
|
goto out_gunlock; |
|
|
|
/* Check out the old directory */ |
|
|
|
error = gfs2_unlink_ok(odip, &odentry->d_name, ip); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
/* Check out the new directory */ |
|
|
|
if (nip) { |
|
error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
if (nip->i_inode.i_nlink == 0) { |
|
error = -EAGAIN; |
|
goto out_gunlock; |
|
} |
|
|
|
if (S_ISDIR(nip->i_inode.i_mode)) { |
|
if (nip->i_entries < 2) { |
|
gfs2_consist_inode(nip); |
|
error = -EIO; |
|
goto out_gunlock; |
|
} |
|
if (nip->i_entries > 2) { |
|
error = -ENOTEMPTY; |
|
goto out_gunlock; |
|
} |
|
} |
|
} else { |
|
error = gfs2_permission(&init_user_ns, ndir, |
|
MAY_WRITE | MAY_EXEC); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
|
switch (error) { |
|
case -ENOENT: |
|
error = 0; |
|
break; |
|
case 0: |
|
error = -EEXIST; |
|
goto out_gunlock; |
|
default: |
|
goto out_gunlock; |
|
} |
|
|
|
if (odip != ndip) { |
|
if (!ndip->i_inode.i_nlink) { |
|
error = -ENOENT; |
|
goto out_gunlock; |
|
} |
|
if (ndip->i_entries == (u32)-1) { |
|
error = -EFBIG; |
|
goto out_gunlock; |
|
} |
|
if (S_ISDIR(ip->i_inode.i_mode) && |
|
ndip->i_inode.i_nlink == (u32)-1) { |
|
error = -EMLINK; |
|
goto out_gunlock; |
|
} |
|
} |
|
} |
|
|
|
/* Check out the dir to be renamed */ |
|
|
|
if (dir_rename) { |
|
error = gfs2_permission(&init_user_ns, d_inode(odentry), |
|
MAY_WRITE); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
|
|
if (nip == NULL) { |
|
error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
|
|
if (da.nr_blocks) { |
|
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; |
|
error = gfs2_quota_lock_check(ndip, &ap); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = gfs2_inplace_reserve(ndip, &ap); |
|
if (error) |
|
goto out_gunlock_q; |
|
|
|
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + |
|
4 * RES_LEAF + 4, 0); |
|
if (error) |
|
goto out_ipreserv; |
|
} else { |
|
error = gfs2_trans_begin(sdp, 4 * RES_DINODE + |
|
5 * RES_LEAF + 4, 0); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
|
|
/* Remove the target file, if it exists */ |
|
|
|
if (nip) |
|
error = gfs2_unlink_inode(ndip, ndentry); |
|
|
|
error = update_moved_ino(ip, ndip, dir_rename); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
error = gfs2_dir_del(odip, odentry); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
out_end_trans: |
|
gfs2_trans_end(sdp); |
|
out_ipreserv: |
|
if (da.nr_blocks) |
|
gfs2_inplace_release(ndip); |
|
out_gunlock_q: |
|
if (da.nr_blocks) |
|
gfs2_quota_unlock(ndip); |
|
out_gunlock: |
|
gfs2_dir_no_add(&da); |
|
if (gfs2_holder_initialized(&rd_gh)) |
|
gfs2_glock_dq_uninit(&rd_gh); |
|
|
|
while (x--) { |
|
if (gfs2_holder_queued(ghs + x)) |
|
gfs2_glock_dq(ghs + x); |
|
gfs2_holder_uninit(ghs + x); |
|
} |
|
out_gunlock_r: |
|
if (gfs2_holder_initialized(&r_gh)) |
|
gfs2_glock_dq_uninit(&r_gh); |
|
out: |
|
gfs2_qa_put(ndip); |
|
return error; |
|
} |
|
|
|
/** |
|
* gfs2_exchange - exchange two files |
|
* @odir: Parent directory of old file name |
|
* @odentry: The old dentry of the file |
|
* @ndir: Parent directory of new file name |
|
* @ndentry: The new dentry of the file |
|
* @flags: The rename flags |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_exchange(struct inode *odir, struct dentry *odentry, |
|
struct inode *ndir, struct dentry *ndentry, |
|
unsigned int flags) |
|
{ |
|
struct gfs2_inode *odip = GFS2_I(odir); |
|
struct gfs2_inode *ndip = GFS2_I(ndir); |
|
struct gfs2_inode *oip = GFS2_I(odentry->d_inode); |
|
struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); |
|
struct gfs2_sbd *sdp = GFS2_SB(odir); |
|
struct gfs2_holder ghs[4], r_gh; |
|
unsigned int num_gh; |
|
unsigned int x; |
|
umode_t old_mode = oip->i_inode.i_mode; |
|
umode_t new_mode = nip->i_inode.i_mode; |
|
int error; |
|
|
|
gfs2_holder_mark_uninitialized(&r_gh); |
|
error = gfs2_rindex_update(sdp); |
|
if (error) |
|
return error; |
|
|
|
if (odip != ndip) { |
|
error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, |
|
0, &r_gh); |
|
if (error) |
|
goto out; |
|
|
|
if (S_ISDIR(old_mode)) { |
|
/* don't move a directory into its subdir */ |
|
error = gfs2_ok_to_move(oip, ndip); |
|
if (error) |
|
goto out_gunlock_r; |
|
} |
|
|
|
if (S_ISDIR(new_mode)) { |
|
/* don't move a directory into its subdir */ |
|
error = gfs2_ok_to_move(nip, odip); |
|
if (error) |
|
goto out_gunlock_r; |
|
} |
|
} |
|
|
|
num_gh = 1; |
|
gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); |
|
if (odip != ndip) { |
|
gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, |
|
ghs + num_gh); |
|
num_gh++; |
|
} |
|
gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); |
|
num_gh++; |
|
|
|
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); |
|
num_gh++; |
|
|
|
for (x = 0; x < num_gh; x++) { |
|
error = gfs2_glock_nq(ghs + x); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
|
|
error = gfs2_glock_async_wait(num_gh, ghs); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = -ENOENT; |
|
if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) |
|
goto out_gunlock; |
|
|
|
error = gfs2_unlink_ok(odip, &odentry->d_name, oip); |
|
if (error) |
|
goto out_gunlock; |
|
error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
if (S_ISDIR(old_mode)) { |
|
error = gfs2_permission(&init_user_ns, odentry->d_inode, |
|
MAY_WRITE); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
if (S_ISDIR(new_mode)) { |
|
error = gfs2_permission(&init_user_ns, ndentry->d_inode, |
|
MAY_WRITE); |
|
if (error) |
|
goto out_gunlock; |
|
} |
|
error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); |
|
if (error) |
|
goto out_gunlock; |
|
|
|
error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, |
|
IF2DT(old_mode)); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
error = gfs2_dir_mvino(odip, &odentry->d_name, nip, |
|
IF2DT(new_mode)); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
if (odip != ndip) { |
|
if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { |
|
inc_nlink(&odip->i_inode); |
|
drop_nlink(&ndip->i_inode); |
|
} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { |
|
inc_nlink(&ndip->i_inode); |
|
drop_nlink(&odip->i_inode); |
|
} |
|
} |
|
mark_inode_dirty(&ndip->i_inode); |
|
if (odip != ndip) |
|
mark_inode_dirty(&odip->i_inode); |
|
|
|
out_end_trans: |
|
gfs2_trans_end(sdp); |
|
out_gunlock: |
|
while (x--) { |
|
if (gfs2_holder_queued(ghs + x)) |
|
gfs2_glock_dq(ghs + x); |
|
gfs2_holder_uninit(ghs + x); |
|
} |
|
out_gunlock_r: |
|
if (gfs2_holder_initialized(&r_gh)) |
|
gfs2_glock_dq_uninit(&r_gh); |
|
out: |
|
return error; |
|
} |
|
|
|
static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir, |
|
struct dentry *odentry, struct inode *ndir, |
|
struct dentry *ndentry, unsigned int flags) |
|
{ |
|
flags &= ~RENAME_NOREPLACE; |
|
|
|
if (flags & ~RENAME_EXCHANGE) |
|
return -EINVAL; |
|
|
|
if (flags & RENAME_EXCHANGE) |
|
return gfs2_exchange(odir, odentry, ndir, ndentry, flags); |
|
|
|
return gfs2_rename(odir, odentry, ndir, ndentry); |
|
} |
|
|
|
/** |
|
* gfs2_get_link - Follow a symbolic link |
|
* @dentry: The dentry of the link |
|
* @inode: The inode of the link |
|
* @done: destructor for return value |
|
* |
|
* This can handle symlinks of any size. |
|
* |
|
* Returns: 0 on success or error code |
|
*/ |
|
|
|
static const char *gfs2_get_link(struct dentry *dentry, |
|
struct inode *inode, |
|
struct delayed_call *done) |
|
{ |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder i_gh; |
|
struct buffer_head *dibh; |
|
unsigned int size; |
|
char *buf; |
|
int error; |
|
|
|
if (!dentry) |
|
return ERR_PTR(-ECHILD); |
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); |
|
error = gfs2_glock_nq(&i_gh); |
|
if (error) { |
|
gfs2_holder_uninit(&i_gh); |
|
return ERR_PTR(error); |
|
} |
|
|
|
size = (unsigned int)i_size_read(&ip->i_inode); |
|
if (size == 0) { |
|
gfs2_consist_inode(ip); |
|
buf = ERR_PTR(-EIO); |
|
goto out; |
|
} |
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh); |
|
if (error) { |
|
buf = ERR_PTR(error); |
|
goto out; |
|
} |
|
|
|
buf = kzalloc(size + 1, GFP_NOFS); |
|
if (!buf) |
|
buf = ERR_PTR(-ENOMEM); |
|
else |
|
memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
|
brelse(dibh); |
|
out: |
|
gfs2_glock_dq_uninit(&i_gh); |
|
if (!IS_ERR(buf)) |
|
set_delayed_call(done, kfree_link, buf); |
|
return buf; |
|
} |
|
|
|
/** |
|
* gfs2_permission |
|
* @mnt_userns: User namespace of the mount the inode was found from |
|
* @inode: The inode |
|
* @mask: The mask to be tested |
|
* |
|
* This may be called from the VFS directly, or from within GFS2 with the |
|
* inode locked, so we look to see if the glock is already locked and only |
|
* lock the glock if its not already been done. |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode, |
|
int mask) |
|
{ |
|
struct gfs2_inode *ip; |
|
struct gfs2_holder i_gh; |
|
int error; |
|
|
|
gfs2_holder_mark_uninitialized(&i_gh); |
|
ip = GFS2_I(inode); |
|
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
|
if (mask & MAY_NOT_BLOCK) |
|
return -ECHILD; |
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
|
if (error) |
|
return error; |
|
} |
|
|
|
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
|
error = -EPERM; |
|
else |
|
error = generic_permission(&init_user_ns, inode, mask); |
|
if (gfs2_holder_initialized(&i_gh)) |
|
gfs2_glock_dq_uninit(&i_gh); |
|
|
|
return error; |
|
} |
|
|
|
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
|
{ |
|
setattr_copy(&init_user_ns, inode, attr); |
|
mark_inode_dirty(inode); |
|
return 0; |
|
} |
|
|
|
static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
|
{ |
|
int error; |
|
|
|
if (current->journal_info) |
|
return __gfs2_setattr_simple(inode, attr); |
|
|
|
error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); |
|
if (error) |
|
return error; |
|
|
|
error = __gfs2_setattr_simple(inode, attr); |
|
gfs2_trans_end(GFS2_SB(inode)); |
|
return error; |
|
} |
|
|
|
static int setattr_chown(struct inode *inode, struct iattr *attr) |
|
{ |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_sbd *sdp = GFS2_SB(inode); |
|
kuid_t ouid, nuid; |
|
kgid_t ogid, ngid; |
|
int error; |
|
struct gfs2_alloc_parms ap; |
|
|
|
ouid = inode->i_uid; |
|
ogid = inode->i_gid; |
|
nuid = attr->ia_uid; |
|
ngid = attr->ia_gid; |
|
|
|
if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) |
|
ouid = nuid = NO_UID_QUOTA_CHANGE; |
|
if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) |
|
ogid = ngid = NO_GID_QUOTA_CHANGE; |
|
error = gfs2_qa_get(ip); |
|
if (error) |
|
return error; |
|
|
|
error = gfs2_rindex_update(sdp); |
|
if (error) |
|
goto out; |
|
|
|
error = gfs2_quota_lock(ip, nuid, ngid); |
|
if (error) |
|
goto out; |
|
|
|
ap.target = gfs2_get_inode_blocks(&ip->i_inode); |
|
|
|
if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
|
!gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { |
|
error = gfs2_quota_check(ip, nuid, ngid, &ap); |
|
if (error) |
|
goto out_gunlock_q; |
|
} |
|
|
|
error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); |
|
if (error) |
|
goto out_gunlock_q; |
|
|
|
error = gfs2_setattr_simple(inode, attr); |
|
if (error) |
|
goto out_end_trans; |
|
|
|
if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
|
!gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { |
|
gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); |
|
gfs2_quota_change(ip, ap.target, nuid, ngid); |
|
} |
|
|
|
out_end_trans: |
|
gfs2_trans_end(sdp); |
|
out_gunlock_q: |
|
gfs2_quota_unlock(ip); |
|
out: |
|
gfs2_qa_put(ip); |
|
return error; |
|
} |
|
|
|
/** |
|
* gfs2_setattr - Change attributes on an inode |
|
* @mnt_userns: User namespace of the mount the inode was found from |
|
* @dentry: The dentry which is changing |
|
* @attr: The structure describing the change |
|
* |
|
* The VFS layer wants to change one or more of an inodes attributes. Write |
|
* that change out to disk. |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_setattr(struct user_namespace *mnt_userns, |
|
struct dentry *dentry, struct iattr *attr) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder i_gh; |
|
int error; |
|
|
|
error = gfs2_qa_get(ip); |
|
if (error) |
|
return error; |
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
|
if (error) |
|
goto out; |
|
|
|
error = -EPERM; |
|
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) |
|
goto error; |
|
|
|
error = setattr_prepare(&init_user_ns, dentry, attr); |
|
if (error) |
|
goto error; |
|
|
|
if (attr->ia_valid & ATTR_SIZE) |
|
error = gfs2_setattr_size(inode, attr->ia_size); |
|
else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
|
error = setattr_chown(inode, attr); |
|
else { |
|
error = gfs2_setattr_simple(inode, attr); |
|
if (!error && attr->ia_valid & ATTR_MODE) |
|
error = posix_acl_chmod(&init_user_ns, inode, |
|
inode->i_mode); |
|
} |
|
|
|
error: |
|
if (!error) |
|
mark_inode_dirty(inode); |
|
gfs2_glock_dq_uninit(&i_gh); |
|
out: |
|
gfs2_qa_put(ip); |
|
return error; |
|
} |
|
|
|
/** |
|
* gfs2_getattr - Read out an inode's attributes |
|
* @mnt_userns: user namespace of the mount the inode was found from |
|
* @path: Object to query |
|
* @stat: The inode's stats |
|
* @request_mask: Mask of STATX_xxx flags indicating the caller's interests |
|
* @flags: AT_STATX_xxx setting |
|
* |
|
* This may be called from the VFS directly, or from within GFS2 with the |
|
* inode locked, so we look to see if the glock is already locked and only |
|
* lock the glock if its not already been done. Note that its the NFS |
|
* readdirplus operation which causes this to be called (from filldir) |
|
* with the glock already held. |
|
* |
|
* Returns: errno |
|
*/ |
|
|
|
static int gfs2_getattr(struct user_namespace *mnt_userns, |
|
const struct path *path, struct kstat *stat, |
|
u32 request_mask, unsigned int flags) |
|
{ |
|
struct inode *inode = d_inode(path->dentry); |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder gh; |
|
u32 gfsflags; |
|
int error; |
|
|
|
gfs2_holder_mark_uninitialized(&gh); |
|
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
|
if (error) |
|
return error; |
|
} |
|
|
|
gfsflags = ip->i_diskflags; |
|
if (gfsflags & GFS2_DIF_APPENDONLY) |
|
stat->attributes |= STATX_ATTR_APPEND; |
|
if (gfsflags & GFS2_DIF_IMMUTABLE) |
|
stat->attributes |= STATX_ATTR_IMMUTABLE; |
|
|
|
stat->attributes_mask |= (STATX_ATTR_APPEND | |
|
STATX_ATTR_COMPRESSED | |
|
STATX_ATTR_ENCRYPTED | |
|
STATX_ATTR_IMMUTABLE | |
|
STATX_ATTR_NODUMP); |
|
|
|
generic_fillattr(&init_user_ns, inode, stat); |
|
|
|
if (gfs2_holder_initialized(&gh)) |
|
gfs2_glock_dq_uninit(&gh); |
|
|
|
return 0; |
|
} |
|
|
|
static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
|
u64 start, u64 len) |
|
{ |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder gh; |
|
int ret; |
|
|
|
inode_lock_shared(inode); |
|
|
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
|
if (ret) |
|
goto out; |
|
|
|
ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); |
|
|
|
gfs2_glock_dq_uninit(&gh); |
|
|
|
out: |
|
inode_unlock_shared(inode); |
|
return ret; |
|
} |
|
|
|
loff_t gfs2_seek_data(struct file *file, loff_t offset) |
|
{ |
|
struct inode *inode = file->f_mapping->host; |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder gh; |
|
loff_t ret; |
|
|
|
inode_lock_shared(inode); |
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
|
if (!ret) |
|
ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); |
|
gfs2_glock_dq_uninit(&gh); |
|
inode_unlock_shared(inode); |
|
|
|
if (ret < 0) |
|
return ret; |
|
return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); |
|
} |
|
|
|
loff_t gfs2_seek_hole(struct file *file, loff_t offset) |
|
{ |
|
struct inode *inode = file->f_mapping->host; |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_holder gh; |
|
loff_t ret; |
|
|
|
inode_lock_shared(inode); |
|
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
|
if (!ret) |
|
ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); |
|
gfs2_glock_dq_uninit(&gh); |
|
inode_unlock_shared(inode); |
|
|
|
if (ret < 0) |
|
return ret; |
|
return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); |
|
} |
|
|
|
static int gfs2_update_time(struct inode *inode, struct timespec64 *time, |
|
int flags) |
|
{ |
|
struct gfs2_inode *ip = GFS2_I(inode); |
|
struct gfs2_glock *gl = ip->i_gl; |
|
struct gfs2_holder *gh; |
|
int error; |
|
|
|
gh = gfs2_glock_is_locked_by_me(gl); |
|
if (gh && !gfs2_glock_is_held_excl(gl)) { |
|
gfs2_glock_dq(gh); |
|
gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); |
|
error = gfs2_glock_nq(gh); |
|
if (error) |
|
return error; |
|
} |
|
return generic_update_time(inode, time, flags); |
|
} |
|
|
|
static const struct inode_operations gfs2_file_iops = { |
|
.permission = gfs2_permission, |
|
.setattr = gfs2_setattr, |
|
.getattr = gfs2_getattr, |
|
.listxattr = gfs2_listxattr, |
|
.fiemap = gfs2_fiemap, |
|
.get_acl = gfs2_get_acl, |
|
.set_acl = gfs2_set_acl, |
|
.update_time = gfs2_update_time, |
|
.fileattr_get = gfs2_fileattr_get, |
|
.fileattr_set = gfs2_fileattr_set, |
|
}; |
|
|
|
static const struct inode_operations gfs2_dir_iops = { |
|
.create = gfs2_create, |
|
.lookup = gfs2_lookup, |
|
.link = gfs2_link, |
|
.unlink = gfs2_unlink, |
|
.symlink = gfs2_symlink, |
|
.mkdir = gfs2_mkdir, |
|
.rmdir = gfs2_unlink, |
|
.mknod = gfs2_mknod, |
|
.rename = gfs2_rename2, |
|
.permission = gfs2_permission, |
|
.setattr = gfs2_setattr, |
|
.getattr = gfs2_getattr, |
|
.listxattr = gfs2_listxattr, |
|
.fiemap = gfs2_fiemap, |
|
.get_acl = gfs2_get_acl, |
|
.set_acl = gfs2_set_acl, |
|
.update_time = gfs2_update_time, |
|
.atomic_open = gfs2_atomic_open, |
|
.fileattr_get = gfs2_fileattr_get, |
|
.fileattr_set = gfs2_fileattr_set, |
|
}; |
|
|
|
static const struct inode_operations gfs2_symlink_iops = { |
|
.get_link = gfs2_get_link, |
|
.permission = gfs2_permission, |
|
.setattr = gfs2_setattr, |
|
.getattr = gfs2_getattr, |
|
.listxattr = gfs2_listxattr, |
|
.fiemap = gfs2_fiemap, |
|
}; |
|
|
|
|