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18 lines
979 B
18 lines
979 B
.. SPDX-License-Identifier: GPL-2.0 |
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Large Extended Attribute Values |
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------------------------------- |
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To enable ext4 to store extended attribute values that do not fit in the |
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inode or in the single extended attribute block attached to an inode, |
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the EA\_INODE feature allows us to store the value in the data blocks of |
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a regular file inode. This “EA inode” is linked only from the extended |
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attribute name index and must not appear in a directory entry. The |
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inode's i\_atime field is used to store a checksum of the xattr value; |
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and i\_ctime/i\_version store a 64-bit reference count, which enables |
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sharing of large xattr values between multiple owning inodes. For |
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backward compatibility with older versions of this feature, the |
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i\_mtime/i\_generation *may* store a back-reference to the inode number |
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and i\_generation of the **one** owning inode (in cases where the EA |
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inode is not referenced by multiple inodes) to verify that the EA inode |
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is the correct one being accessed.
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