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ext4: Document an edge case for overwrites

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ext4_iomap_overwrite_begin() clears the flag for IOMAP_WRITE before
calling ext4_iomap_begin(). Document this above ext4_map_blocks() call
as it is easy to miss it when focusing on write paths alone.

Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://patch.msgid.link/fd50ba05440042dff77d555e463a620a79f8d0e9.1747337952.git.ritesh.list@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ritesh Harjani (IBM) 2025-05-16 01:20:49 +05:30 committed by Theodore Ts'o
parent fff6f35b9b
commit 9fa6121684
1 changed files with 4 additions and 0 deletions
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4
fs/ext4/inode.c
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@ -3490,6 +3490,10 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
}
ret = ext4_iomap_alloc(inode, &map, flags);
} else {
/*
* This can be called for overwrites path from
* ext4_iomap_overwrite_begin().
*/
ret = ext4_map_blocks(NULL, inode, &map, 0);
}