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FROMLIST: fscrypt: Have filesystems handle their d_ops

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This shifts the responsibility of setting up dentry operations from
fscrypt to the individual filesystems, allowing them to have their own
operations while still setting fscrypt's d_revalidate as appropriate.

Also added helper function to libfs to unify ext4 and f2fs
implementations.

Signed-off-by: Daniel Rosenberg <[email protected]>
Test: Boots, /data/media is case insensitive
Bug: 138322712
Link: https://lore.kernel.org/linux-f2fs-devel/[email protected]/T/#t
Change-Id: Iaf77f8c5961ecf22e22478701ab0b7fe2025225d
This commit is contained in:
Daniel Rosenberg 2020-01-27 20:04:40 -08:00 • committed by Alistair Delva
commit d16d9c0046
14 changed files with 78 additions and 32 deletions
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50
fs/libfs.c
View file

@ -1351,4 +1351,54 @@ err:
return ret;
}
EXPORT_SYMBOL(generic_ci_d_hash);
static const struct dentry_operations generic_ci_dentry_ops = {
.d_hash = generic_ci_d_hash,
.d_compare = generic_ci_d_compare,
};
#endif
#ifdef CONFIG_FS_ENCRYPTION
static const struct dentry_operations generic_encrypted_dentry_ops = {
.d_revalidate = fscrypt_d_revalidate,
};
#endif
#if IS_ENABLED(CONFIG_UNICODE) && IS_ENABLED(CONFIG_FS_ENCRYPTION)
static const struct dentry_operations generic_encrypted_ci_dentry_ops = {
.d_hash = generic_ci_d_hash,
.d_compare = generic_ci_d_compare,
.d_revalidate = fscrypt_d_revalidate,
};
#endif
/**
* generic_set_encrypted_ci_d_ops - helper for setting d_ops for given dentry
* @dir: parent of dentry whose ops to set
* @dentry: detnry to set ops on
*
* This function sets the dentry ops for the given dentry to handle both
* casefolding and encryption of the dentry name.
*/
void generic_set_encrypted_ci_d_ops(struct inode *dir, struct dentry *dentry)
{
#ifdef CONFIG_FS_ENCRYPTION
if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) {
#ifdef CONFIG_UNICODE
if (dir->i_sb->s_encoding) {
d_set_d_op(dentry, &generic_encrypted_ci_dentry_ops);
return;
}
#endif
d_set_d_op(dentry, &generic_encrypted_dentry_ops);
return;
}
#endif
#ifdef CONFIG_UNICODE
if (dir->i_sb->s_encoding) {
d_set_d_op(dentry, &generic_ci_dentry_ops);
return;
}
#endif
}
EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops);