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603 lines
20 KiB
603 lines
20 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* |
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* Copyright (C) 2011 Novell Inc. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/uuid.h> |
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#include <linux/fs.h> |
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#include "ovl_entry.h" |
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#undef pr_fmt |
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#define pr_fmt(fmt) "overlayfs: " fmt |
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enum ovl_path_type { |
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__OVL_PATH_UPPER = (1 << 0), |
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__OVL_PATH_MERGE = (1 << 1), |
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__OVL_PATH_ORIGIN = (1 << 2), |
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}; |
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#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
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#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) |
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#define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
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#define OVL_XATTR_NAMESPACE "overlay." |
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#define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE |
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#define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE |
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enum ovl_xattr { |
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OVL_XATTR_OPAQUE, |
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OVL_XATTR_REDIRECT, |
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OVL_XATTR_ORIGIN, |
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OVL_XATTR_IMPURE, |
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OVL_XATTR_NLINK, |
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OVL_XATTR_UPPER, |
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OVL_XATTR_METACOPY, |
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OVL_XATTR_PROTATTR, |
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}; |
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enum ovl_inode_flag { |
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/* Pure upper dir that may contain non pure upper entries */ |
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OVL_IMPURE, |
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/* Non-merge dir that may contain whiteout entries */ |
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OVL_WHITEOUTS, |
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OVL_INDEX, |
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OVL_UPPERDATA, |
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/* Inode number will remain constant over copy up. */ |
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OVL_CONST_INO, |
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}; |
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enum ovl_entry_flag { |
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OVL_E_UPPER_ALIAS, |
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OVL_E_OPAQUE, |
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OVL_E_CONNECTED, |
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}; |
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enum { |
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OVL_XINO_OFF, |
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OVL_XINO_AUTO, |
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OVL_XINO_ON, |
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}; |
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/* |
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* The tuple (fh,uuid) is a universal unique identifier for a copy up origin, |
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* where: |
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* origin.fh - exported file handle of the lower file |
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* origin.uuid - uuid of the lower filesystem |
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*/ |
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#define OVL_FH_VERSION 0 |
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#define OVL_FH_MAGIC 0xfb |
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/* CPU byte order required for fid decoding: */ |
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#define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) |
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#define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) |
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/* Is the real inode encoded in fid an upper inode? */ |
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#define OVL_FH_FLAG_PATH_UPPER (1 << 2) |
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#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \ |
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OVL_FH_FLAG_PATH_UPPER) |
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#if defined(__LITTLE_ENDIAN) |
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#define OVL_FH_FLAG_CPU_ENDIAN 0 |
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#elif defined(__BIG_ENDIAN) |
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#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN |
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#else |
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#error Endianness not defined |
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#endif |
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/* The type used to be returned by overlay exportfs for misaligned fid */ |
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#define OVL_FILEID_V0 0xfb |
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/* The type returned by overlay exportfs for 32bit aligned fid */ |
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#define OVL_FILEID_V1 0xf8 |
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/* On-disk format for "origin" file handle */ |
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struct ovl_fb { |
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u8 version; /* 0 */ |
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u8 magic; /* 0xfb */ |
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u8 len; /* size of this header + size of fid */ |
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u8 flags; /* OVL_FH_FLAG_* */ |
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u8 type; /* fid_type of fid */ |
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uuid_t uuid; /* uuid of filesystem */ |
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u32 fid[]; /* file identifier should be 32bit aligned in-memory */ |
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} __packed; |
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/* In-memory and on-wire format for overlay file handle */ |
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struct ovl_fh { |
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u8 padding[3]; /* make sure fb.fid is 32bit aligned */ |
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union { |
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struct ovl_fb fb; |
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u8 buf[0]; |
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}; |
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} __packed; |
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#define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb) |
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#define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len) |
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#define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ |
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offsetof(struct ovl_fb, fid)) |
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extern const char *const ovl_xattr_table[][2]; |
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static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) |
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{ |
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return ovl_xattr_table[ox][ofs->config.userxattr]; |
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} |
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static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) |
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{ |
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int err = vfs_rmdir(&init_user_ns, dir, dentry); |
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pr_debug("rmdir(%pd2) = %i\n", dentry, err); |
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return err; |
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} |
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static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) |
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{ |
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int err = vfs_unlink(&init_user_ns, dir, dentry, NULL); |
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pr_debug("unlink(%pd2) = %i\n", dentry, err); |
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return err; |
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} |
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static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, |
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struct dentry *new_dentry) |
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{ |
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int err = vfs_link(old_dentry, &init_user_ns, dir, new_dentry, NULL); |
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pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err); |
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return err; |
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} |
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static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, |
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umode_t mode) |
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{ |
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int err = vfs_create(&init_user_ns, dir, dentry, mode, true); |
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pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); |
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return err; |
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} |
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static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, |
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umode_t mode) |
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{ |
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int err = vfs_mkdir(&init_user_ns, dir, dentry, mode); |
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pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); |
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return err; |
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} |
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static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, |
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umode_t mode, dev_t dev) |
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{ |
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int err = vfs_mknod(&init_user_ns, dir, dentry, mode, dev); |
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pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err); |
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return err; |
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} |
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static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, |
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const char *oldname) |
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{ |
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int err = vfs_symlink(&init_user_ns, dir, dentry, oldname); |
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pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); |
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return err; |
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} |
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static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry, |
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enum ovl_xattr ox, void *value, |
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size_t size) |
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{ |
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const char *name = ovl_xattr(ofs, ox); |
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int err = vfs_getxattr(&init_user_ns, dentry, name, value, size); |
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int len = (value && err > 0) ? err : 0; |
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pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", |
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dentry, name, min(len, 48), value, size, err); |
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return err; |
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} |
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static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry, |
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enum ovl_xattr ox, const void *value, |
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size_t size) |
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{ |
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const char *name = ovl_xattr(ofs, ox); |
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int err = vfs_setxattr(&init_user_ns, dentry, name, value, size, 0); |
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pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n", |
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dentry, name, min((int)size, 48), value, size, err); |
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return err; |
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} |
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static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry, |
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enum ovl_xattr ox) |
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{ |
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const char *name = ovl_xattr(ofs, ox); |
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int err = vfs_removexattr(&init_user_ns, dentry, name); |
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pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); |
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return err; |
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} |
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static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, |
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struct inode *newdir, struct dentry *newdentry, |
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unsigned int flags) |
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{ |
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int err; |
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struct renamedata rd = { |
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.old_mnt_userns = &init_user_ns, |
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.old_dir = olddir, |
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.old_dentry = olddentry, |
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.new_mnt_userns = &init_user_ns, |
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.new_dir = newdir, |
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.new_dentry = newdentry, |
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.flags = flags, |
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}; |
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pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags); |
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err = vfs_rename(&rd); |
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if (err) { |
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pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
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olddentry, newdentry, err); |
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} |
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return err; |
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} |
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static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) |
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{ |
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int err = vfs_whiteout(&init_user_ns, dir, dentry); |
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pr_debug("whiteout(%pd2) = %i\n", dentry, err); |
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return err; |
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} |
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static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
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{ |
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struct dentry *ret = vfs_tmpfile(&init_user_ns, dentry, mode, 0); |
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int err = PTR_ERR_OR_ZERO(ret); |
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pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); |
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return ret; |
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} |
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static inline bool ovl_open_flags_need_copy_up(int flags) |
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{ |
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if (!flags) |
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return false; |
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return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)); |
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} |
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static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs) |
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{ |
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/* |
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* To avoid regressions in existing setups with overlay lower offline |
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* changes, we allow lower changes only if none of the new features |
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* are used. |
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*/ |
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return (!ofs->config.index && !ofs->config.metacopy && |
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!ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON); |
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} |
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/* util.c */ |
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int ovl_want_write(struct dentry *dentry); |
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void ovl_drop_write(struct dentry *dentry); |
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struct dentry *ovl_workdir(struct dentry *dentry); |
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const struct cred *ovl_override_creds(struct super_block *sb); |
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int ovl_can_decode_fh(struct super_block *sb); |
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struct dentry *ovl_indexdir(struct super_block *sb); |
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bool ovl_index_all(struct super_block *sb); |
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bool ovl_verify_lower(struct super_block *sb); |
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struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
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bool ovl_dentry_remote(struct dentry *dentry); |
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void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry, |
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unsigned int mask); |
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bool ovl_dentry_weird(struct dentry *dentry); |
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enum ovl_path_type ovl_path_type(struct dentry *dentry); |
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void ovl_path_upper(struct dentry *dentry, struct path *path); |
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void ovl_path_lower(struct dentry *dentry, struct path *path); |
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void ovl_path_lowerdata(struct dentry *dentry, struct path *path); |
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enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); |
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struct dentry *ovl_dentry_upper(struct dentry *dentry); |
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struct dentry *ovl_dentry_lower(struct dentry *dentry); |
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struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); |
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const struct ovl_layer *ovl_layer_lower(struct dentry *dentry); |
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struct dentry *ovl_dentry_real(struct dentry *dentry); |
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struct dentry *ovl_i_dentry_upper(struct inode *inode); |
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struct inode *ovl_inode_upper(struct inode *inode); |
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struct inode *ovl_inode_lower(struct inode *inode); |
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struct inode *ovl_inode_lowerdata(struct inode *inode); |
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struct inode *ovl_inode_real(struct inode *inode); |
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struct inode *ovl_inode_realdata(struct inode *inode); |
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struct ovl_dir_cache *ovl_dir_cache(struct inode *inode); |
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void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache); |
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void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry); |
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void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry); |
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bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry); |
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bool ovl_dentry_is_opaque(struct dentry *dentry); |
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bool ovl_dentry_is_whiteout(struct dentry *dentry); |
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void ovl_dentry_set_opaque(struct dentry *dentry); |
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bool ovl_dentry_has_upper_alias(struct dentry *dentry); |
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void ovl_dentry_set_upper_alias(struct dentry *dentry); |
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bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags); |
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bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags); |
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bool ovl_has_upperdata(struct inode *inode); |
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void ovl_set_upperdata(struct inode *inode); |
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bool ovl_redirect_dir(struct super_block *sb); |
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const char *ovl_dentry_get_redirect(struct dentry *dentry); |
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void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); |
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void ovl_inode_update(struct inode *inode, struct dentry *upperdentry); |
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void ovl_dir_modified(struct dentry *dentry, bool impurity); |
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u64 ovl_dentry_version_get(struct dentry *dentry); |
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bool ovl_is_whiteout(struct dentry *dentry); |
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struct file *ovl_path_open(struct path *path, int flags); |
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int ovl_copy_up_start(struct dentry *dentry, int flags); |
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void ovl_copy_up_end(struct dentry *dentry); |
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bool ovl_already_copied_up(struct dentry *dentry, int flags); |
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bool ovl_check_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry); |
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bool ovl_check_dir_xattr(struct super_block *sb, struct dentry *dentry, |
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enum ovl_xattr ox); |
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int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry, |
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enum ovl_xattr ox, const void *value, size_t size, |
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int xerr); |
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int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); |
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bool ovl_inuse_trylock(struct dentry *dentry); |
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void ovl_inuse_unlock(struct dentry *dentry); |
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bool ovl_is_inuse(struct dentry *dentry); |
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bool ovl_need_index(struct dentry *dentry); |
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int ovl_nlink_start(struct dentry *dentry); |
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void ovl_nlink_end(struct dentry *dentry); |
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int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); |
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int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct dentry *dentry); |
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bool ovl_is_metacopy_dentry(struct dentry *dentry); |
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char *ovl_get_redirect_xattr(struct ovl_fs *ofs, struct dentry *dentry, |
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int padding); |
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int ovl_sync_status(struct ovl_fs *ofs); |
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static inline void ovl_set_flag(unsigned long flag, struct inode *inode) |
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{ |
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set_bit(flag, &OVL_I(inode)->flags); |
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} |
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static inline void ovl_clear_flag(unsigned long flag, struct inode *inode) |
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{ |
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clear_bit(flag, &OVL_I(inode)->flags); |
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} |
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static inline bool ovl_test_flag(unsigned long flag, struct inode *inode) |
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{ |
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return test_bit(flag, &OVL_I(inode)->flags); |
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} |
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static inline bool ovl_is_impuredir(struct super_block *sb, |
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struct dentry *dentry) |
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{ |
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return ovl_check_dir_xattr(sb, dentry, OVL_XATTR_IMPURE); |
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} |
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/* |
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* With xino=auto, we do best effort to keep all inodes on same st_dev and |
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* d_ino consistent with st_ino. |
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* With xino=on, we do the same effort but we warn if we failed. |
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*/ |
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static inline bool ovl_xino_warn(struct super_block *sb) |
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{ |
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return OVL_FS(sb)->config.xino == OVL_XINO_ON; |
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} |
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/* All layers on same fs? */ |
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static inline bool ovl_same_fs(struct super_block *sb) |
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{ |
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return OVL_FS(sb)->xino_mode == 0; |
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} |
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/* All overlay inodes have same st_dev? */ |
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static inline bool ovl_same_dev(struct super_block *sb) |
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{ |
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return OVL_FS(sb)->xino_mode >= 0; |
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} |
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static inline unsigned int ovl_xino_bits(struct super_block *sb) |
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{ |
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return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0; |
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} |
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static inline void ovl_inode_lock(struct inode *inode) |
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{ |
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mutex_lock(&OVL_I(inode)->lock); |
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} |
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static inline int ovl_inode_lock_interruptible(struct inode *inode) |
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{ |
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return mutex_lock_interruptible(&OVL_I(inode)->lock); |
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} |
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static inline void ovl_inode_unlock(struct inode *inode) |
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{ |
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mutex_unlock(&OVL_I(inode)->lock); |
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} |
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/* namei.c */ |
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int ovl_check_fb_len(struct ovl_fb *fb, int fb_len); |
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static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len) |
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{ |
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if (fh_len < sizeof(struct ovl_fh)) |
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return -EINVAL; |
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return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET); |
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} |
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struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh, |
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struct vfsmount *mnt, bool connected); |
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int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, |
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struct dentry *upperdentry, struct ovl_path **stackp); |
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int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry, |
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enum ovl_xattr ox, struct dentry *real, bool is_upper, |
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bool set); |
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struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index); |
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int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index); |
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int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin, |
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struct qstr *name); |
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struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh); |
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struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, |
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struct dentry *origin, bool verify); |
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int ovl_path_next(int idx, struct dentry *dentry, struct path *path); |
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struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, |
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unsigned int flags); |
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bool ovl_lower_positive(struct dentry *dentry); |
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static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper, |
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struct dentry *origin, bool set) |
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{ |
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return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin, |
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false, set); |
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} |
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static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index, |
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struct dentry *upper, bool set) |
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{ |
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return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set); |
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} |
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/* readdir.c */ |
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extern const struct file_operations ovl_dir_operations; |
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struct file *ovl_dir_real_file(const struct file *file, bool want_upper); |
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int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); |
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void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); |
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void ovl_cache_free(struct list_head *list); |
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void ovl_dir_cache_free(struct inode *inode); |
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int ovl_check_d_type_supported(struct path *realpath); |
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int ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
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struct dentry *dentry, int level); |
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int ovl_indexdir_cleanup(struct ovl_fs *ofs); |
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|
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/* |
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* Can we iterate real dir directly? |
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* |
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* Non-merge dir may contain whiteouts from a time it was a merge upper, before |
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* lower dir was removed under it and possibly before it was rotated from upper |
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* to lower layer. |
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*/ |
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static inline bool ovl_dir_is_real(struct dentry *dir) |
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{ |
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return !ovl_test_flag(OVL_WHITEOUTS, d_inode(dir)); |
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} |
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|
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/* inode.c */ |
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int ovl_set_nlink_upper(struct dentry *dentry); |
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int ovl_set_nlink_lower(struct dentry *dentry); |
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unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry, |
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struct dentry *upperdentry, |
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unsigned int fallback); |
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int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
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struct iattr *attr); |
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int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path, |
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struct kstat *stat, u32 request_mask, unsigned int flags); |
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int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode, |
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int mask); |
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int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, |
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const void *value, size_t size, int flags); |
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int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, |
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void *value, size_t size); |
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ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
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struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu); |
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int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); |
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bool ovl_is_private_xattr(struct super_block *sb, const char *name); |
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|
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struct ovl_inode_params { |
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struct inode *newinode; |
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struct dentry *upperdentry; |
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struct ovl_path *lowerpath; |
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bool index; |
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unsigned int numlower; |
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char *redirect; |
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struct dentry *lowerdata; |
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}; |
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void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip, |
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unsigned long ino, int fsid); |
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struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
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struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real, |
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bool is_upper); |
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bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir); |
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struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir); |
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struct inode *ovl_get_inode(struct super_block *sb, |
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struct ovl_inode_params *oip); |
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static inline void ovl_copyattr(struct inode *from, struct inode *to) |
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{ |
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to->i_uid = from->i_uid; |
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to->i_gid = from->i_gid; |
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to->i_mode = from->i_mode; |
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to->i_atime = from->i_atime; |
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to->i_mtime = from->i_mtime; |
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to->i_ctime = from->i_ctime; |
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i_size_write(to, i_size_read(from)); |
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} |
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|
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/* vfs inode flags copied from real to ovl inode */ |
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#define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE) |
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/* vfs inode flags read from overlay.protattr xattr to ovl inode */ |
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#define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE) |
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|
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/* |
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* fileattr flags copied from lower to upper inode on copy up. |
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* We cannot copy up immutable/append-only flags, because that would prevent |
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* linking temp inode to upper dir, so we store them in xattr instead. |
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*/ |
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#define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL) |
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#define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME) |
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#define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL) |
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#define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE) |
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|
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void ovl_check_protattr(struct inode *inode, struct dentry *upper); |
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int ovl_set_protattr(struct inode *inode, struct dentry *upper, |
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struct fileattr *fa); |
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|
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static inline void ovl_copyflags(struct inode *from, struct inode *to) |
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{ |
|
unsigned int mask = OVL_COPY_I_FLAGS_MASK; |
|
|
|
inode_set_flags(to, from->i_flags & mask, mask); |
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} |
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|
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/* dir.c */ |
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extern const struct inode_operations ovl_dir_inode_operations; |
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int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir, |
|
struct dentry *dentry); |
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struct ovl_cattr { |
|
dev_t rdev; |
|
umode_t mode; |
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const char *link; |
|
struct dentry *hardlink; |
|
}; |
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|
|
#define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) |
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|
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int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry, umode_t mode); |
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struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, |
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struct ovl_cattr *attr); |
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int ovl_cleanup(struct inode *dir, struct dentry *dentry); |
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struct dentry *ovl_lookup_temp(struct dentry *workdir); |
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struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr); |
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|
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/* file.c */ |
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extern const struct file_operations ovl_file_operations; |
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int __init ovl_aio_request_cache_init(void); |
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void ovl_aio_request_cache_destroy(void); |
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int ovl_real_fileattr_get(struct path *realpath, struct fileattr *fa); |
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int ovl_real_fileattr_set(struct path *realpath, struct fileattr *fa); |
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int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
|
int ovl_fileattr_set(struct user_namespace *mnt_userns, |
|
struct dentry *dentry, struct fileattr *fa); |
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|
|
/* copy_up.c */ |
|
int ovl_copy_up(struct dentry *dentry); |
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int ovl_copy_up_with_data(struct dentry *dentry); |
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int ovl_maybe_copy_up(struct dentry *dentry, int flags); |
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int ovl_copy_xattr(struct super_block *sb, struct dentry *old, |
|
struct dentry *new); |
|
int ovl_set_attr(struct dentry *upper, struct kstat *stat); |
|
struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
|
bool is_upper); |
|
int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
|
struct dentry *upper); |
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|
|
/* export.c */ |
|
extern const struct export_operations ovl_export_operations;
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|
|