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Message-ID: <20240911144502.115260-9-andrealmeid@igalia.com>
Date: Wed, 11 Sep 2024 11:45:00 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Hugh Dickins <hughd@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jan Kara <jack@...e.cz>,
krisman@...nel.org
Cc: linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org,
kernel-dev@...lia.com,
Daniel Rosenberg <drosen@...gle.com>,
smcv@...labora.com,
Christoph Hellwig <hch@....de>,
Theodore Ts'o <tytso@....edu>,
André Almeida <andrealmeid@...lia.com>
Subject: [PATCH v4 08/10] tmpfs: Add flag FS_CASEFOLD_FL support for tmpfs dirs
Enable setting flag FS_CASEFOLD_FL for tmpfs directories, when tmpfs is
mounted with casefold support. A special check is need for this flag,
since it can't be set for non-empty directories.
Signed-off-by: André Almeida <andrealmeid@...lia.com>
---
Changes from v2:
- Fixed bug when adding a non-casefold flag in a non-empty dir
---
include/linux/shmem_fs.h | 6 ++--
mm/shmem.c | 70 ++++++++++++++++++++++++++++++++++++----
2 files changed, 67 insertions(+), 9 deletions(-)
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 1d06b1e5408a..8367ca2b99d9 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -42,10 +42,10 @@ struct shmem_inode_info {
struct inode vfs_inode;
};
-#define SHMEM_FL_USER_VISIBLE FS_FL_USER_VISIBLE
+#define SHMEM_FL_USER_VISIBLE (FS_FL_USER_VISIBLE | FS_CASEFOLD_FL)
#define SHMEM_FL_USER_MODIFIABLE \
- (FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL)
-#define SHMEM_FL_INHERITED (FS_NODUMP_FL | FS_NOATIME_FL)
+ (FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL | FS_CASEFOLD_FL)
+#define SHMEM_FL_INHERITED (FS_NODUMP_FL | FS_NOATIME_FL | FS_CASEFOLD_FL)
struct shmem_quota_limits {
qsize_t usrquota_bhardlimit; /* Default user quota block hard limit */
diff --git a/mm/shmem.c b/mm/shmem.c
index 4fde63596ab3..fc0e0cd46146 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2613,13 +2613,62 @@ static int shmem_file_open(struct inode *inode, struct file *file)
#ifdef CONFIG_TMPFS_XATTR
static int shmem_initxattrs(struct inode *, const struct xattr *, void *);
+#if IS_ENABLED(CONFIG_UNICODE)
+/*
+ * shmem_inode_casefold_flags - Deal with casefold file attribute flag
+ *
+ * The casefold file attribute needs some special checks. I can just be added to
+ * an empty dir, and can't be removed from a non-empty dir.
+ */
+static int shmem_inode_casefold_flags(struct inode *inode, unsigned int fsflags,
+ struct dentry *dentry, unsigned int *i_flags)
+{
+ unsigned int old = inode->i_flags;
+ struct super_block *sb = inode->i_sb;
+
+ if (fsflags & FS_CASEFOLD_FL) {
+ if (!(old & S_CASEFOLD)) {
+ if (!sb->s_encoding)
+ return -EOPNOTSUPP;
+
+ if (!S_ISDIR(inode->i_mode))
+ return -ENOTDIR;
+
+ if (dentry && !simple_empty(dentry))
+ return -ENOTEMPTY;
+ }
+
+ *i_flags = *i_flags | S_CASEFOLD;
+ } else if (old & S_CASEFOLD) {
+ if (dentry && !simple_empty(dentry))
+ return -ENOTEMPTY;
+ }
+
+ return 0;
+}
+#else
+static int shmem_inode_casefold_flags(struct inode *inode, unsigned int fsflags,
+ struct dentry *dentry, unsigned int *i_flags)
+{
+ if (fsflags & FS_CASEFOLD_FL)
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+#endif
+
/*
* chattr's fsflags are unrelated to extended attributes,
* but tmpfs has chosen to enable them under the same config option.
*/
-static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags)
+static int shmem_set_inode_flags(struct inode *inode, unsigned int fsflags, struct dentry *dentry)
{
unsigned int i_flags = 0;
+ int ret;
+
+ ret = shmem_inode_casefold_flags(inode, fsflags, dentry, &i_flags);
+ if (ret)
+ return ret;
if (fsflags & FS_NOATIME_FL)
i_flags |= S_NOATIME;
@@ -2630,10 +2679,12 @@ static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags)
/*
* But FS_NODUMP_FL does not require any action in i_flags.
*/
- inode_set_flags(inode, i_flags, S_NOATIME | S_APPEND | S_IMMUTABLE);
+ inode_set_flags(inode, i_flags, S_NOATIME | S_APPEND | S_IMMUTABLE | S_CASEFOLD);
+
+ return 0;
}
#else
-static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags)
+static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags, struct dentry *dentry)
{
}
#define shmem_initxattrs NULL
@@ -2680,7 +2731,7 @@ static struct inode *__shmem_get_inode(struct mnt_idmap *idmap,
info->fsflags = (dir == NULL) ? 0 :
SHMEM_I(dir)->fsflags & SHMEM_FL_INHERITED;
if (info->fsflags)
- shmem_set_inode_flags(inode, info->fsflags);
+ shmem_set_inode_flags(inode, info->fsflags, NULL);
INIT_LIST_HEAD(&info->shrinklist);
INIT_LIST_HEAD(&info->swaplist);
simple_xattrs_init(&info->xattrs);
@@ -3789,16 +3840,23 @@ static int shmem_fileattr_set(struct mnt_idmap *idmap,
{
struct inode *inode = d_inode(dentry);
struct shmem_inode_info *info = SHMEM_I(inode);
+ int ret, flags;
if (fileattr_has_fsx(fa))
return -EOPNOTSUPP;
if (fa->flags & ~SHMEM_FL_USER_MODIFIABLE)
return -EOPNOTSUPP;
- info->fsflags = (info->fsflags & ~SHMEM_FL_USER_MODIFIABLE) |
+ flags = (info->fsflags & ~SHMEM_FL_USER_MODIFIABLE) |
(fa->flags & SHMEM_FL_USER_MODIFIABLE);
- shmem_set_inode_flags(inode, info->fsflags);
+ ret = shmem_set_inode_flags(inode, flags, dentry);
+
+ if (ret)
+ return ret;
+
+ info->fsflags = flags;
+
inode_set_ctime_current(inode);
inode_inc_iversion(inode);
return 0;
--
2.46.0
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