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ecryptfs: factor out a ecryptfs_iattr_to_lower helper

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Prepare for using the code to create a lower struct iattr in multiple
places.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
This commit is contained in:
Christoph Hellwig
2026-04-08 08:06:41 +02:00
committed by Tyler Hicks
parent 081447ecfc
commit 5d1f0e8cd9
1 changed files with 15 additions and 9 deletions
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24
fs/ecryptfs/inode.c
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@@ -677,6 +677,20 @@ static const char *ecryptfs_get_link(struct dentry *dentry,
return buf;
}
static void ecryptfs_iattr_to_lower(struct iattr *lower_ia,
const struct iattr *ia)
{
memcpy(lower_ia, ia, sizeof(*lower_ia));
if (ia->ia_valid & ATTR_FILE)
lower_ia->ia_file = ecryptfs_file_to_lower(ia->ia_file);
/*
* If the mode change is for clearing setuid/setgid bits, allow the lower
* file system to interpret this in its own way.
*/
if (lower_ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
lower_ia->ia_valid &= ~ATTR_MODE;
}
/**
* upper_size_to_lower_size
* @crypt_stat: Crypt_stat associated with file
@@ -921,21 +935,13 @@ static int ecryptfs_setattr(struct mnt_idmap *idmap,
if (rc)
goto out;
memcpy(&lower_ia, ia, sizeof(lower_ia));
if (ia->ia_valid & ATTR_FILE)
lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
ecryptfs_iattr_to_lower(&lower_ia, ia);
if (ia->ia_valid & ATTR_SIZE) {
rc = truncate_upper(dentry, ia, &lower_ia);
if (rc < 0)
goto out;
}
/*
* mode change is for clearing setuid/setgid bits. Allow lower fs
* to interpret this in its own way.
*/
if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
lower_ia.ia_valid &= ~ATTR_MODE;
inode_lock(d_inode(lower_dentry));
rc = notify_change(&nop_mnt_idmap, lower_dentry, &lower_ia, NULL);