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-rw-r--r--fs/gfs2/file.c69
-rw-r--r--fs/gfs2/inode.c125
-rw-r--r--fs/gfs2/inode.h1
3 files changed, 146 insertions, 49 deletions
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index ad0dc38d87ab..4ed6a03e565b 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -538,21 +538,30 @@ static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
}
/**
- * gfs2_open - open a file
- * @inode: the inode to open
- * @file: the struct file for this opening
+ * gfs2_open_common - This is common to open and atomic_open
+ * @inode: The inode being opened
+ * @file: The file being opened
*
- * Returns: errno
+ * This maybe called under a glock or not depending upon how it has
+ * been called. We must always be called under a glock for regular
+ * files, however. For other file types, it does not matter whether
+ * we hold the glock or not.
+ *
+ * Returns: Error code or 0 for success
*/
-static int gfs2_open(struct inode *inode, struct file *file)
+int gfs2_open_common(struct inode *inode, struct file *file)
{
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_holder i_gh;
struct gfs2_file *fp;
- int error;
+ int ret;
- fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
+ if (S_ISREG(inode->i_mode)) {
+ ret = generic_file_open(inode, file);
+ if (ret)
+ return ret;
+ }
+
+ fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
if (!fp)
return -ENOMEM;
@@ -560,29 +569,43 @@ static int gfs2_open(struct inode *inode, struct file *file)
gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
file->private_data = fp;
+ return 0;
+}
+
+/**
+ * gfs2_open - open a file
+ * @inode: the inode to open
+ * @file: the struct file for this opening
+ *
+ * After atomic_open, this function is only used for opening files
+ * which are already cached. We must still get the glock for regular
+ * files to ensure that we have the file size uptodate for the large
+ * file check which is in the common code. That is only an issue for
+ * regular files though.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_open(struct inode *inode, struct file *file)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder i_gh;
+ int error;
+ bool need_unlock = false;
if (S_ISREG(ip->i_inode.i_mode)) {
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
&i_gh);
if (error)
- goto fail;
+ return error;
+ need_unlock = true;
+ }
- if (!(file->f_flags & O_LARGEFILE) &&
- i_size_read(inode) > MAX_NON_LFS) {
- error = -EOVERFLOW;
- goto fail_gunlock;
- }
+ error = gfs2_open_common(inode, file);
+ if (need_unlock)
gfs2_glock_dq_uninit(&i_gh);
- }
-
- return 0;
-fail_gunlock:
- gfs2_glock_dq_uninit(&i_gh);
-fail:
- file->private_data = NULL;
- kfree(fp);
return error;
}
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index ede16ae784e2..bbb2715171cd 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -535,6 +535,7 @@ static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
* gfs2_create_inode - Create a new inode
* @dir: The parent directory
* @dentry: The new dentry
+ * @file: If non-NULL, the file which is being opened
* @mode: The permissions on the new inode
* @dev: For device nodes, this is the device number
* @symname: For symlinks, this is the link destination
@@ -544,8 +545,9 @@ static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
*/
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
+ struct file *file,
umode_t mode, dev_t dev, const char *symname,
- unsigned int size, int excl)
+ unsigned int size, int excl, int *opened)
{
const struct qstr *name = &dentry->d_name;
struct gfs2_holder ghs[2];
@@ -553,6 +555,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
struct gfs2_inode *dip = GFS2_I(dir), *ip;
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_glock *io_gl;
+ struct dentry *d;
int error;
u32 aflags = 0;
int arq;
@@ -579,9 +582,20 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
error = PTR_ERR(inode);
if (!IS_ERR(inode)) {
+ d = d_splice_alias(inode, dentry);
+ error = 0;
+ if (file && !IS_ERR(d)) {
+ if (d == NULL)
+ d = dentry;
+ if (S_ISREG(inode->i_mode))
+ error = finish_open(file, d, gfs2_open_common, opened);
+ else
+ error = finish_no_open(file, d);
+ }
gfs2_glock_dq_uninit(ghs);
- d_instantiate(dentry, inode);
- return 0;
+ if (IS_ERR(d))
+ return PTR_RET(d);
+ return error;
} else if (error != -ENOENT) {
goto fail_gunlock;
}
@@ -679,10 +693,12 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
goto fail_gunlock3;
mark_inode_dirty(inode);
+ d_instantiate(dentry, inode);
+ if (file)
+ error = finish_open(file, dentry, gfs2_open_common, opened);
gfs2_glock_dq_uninit(ghs);
gfs2_glock_dq_uninit(ghs + 1);
- d_instantiate(dentry, inode);
- return 0;
+ return error;
fail_gunlock3:
gfs2_glock_dq_uninit(ghs + 1);
@@ -722,36 +738,56 @@ fail:
static int gfs2_create(struct inode *dir, struct dentry *dentry,
umode_t mode, bool excl)
{
- return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
+ return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
}
/**
- * gfs2_lookup - Look up a filename in a directory and return its inode
+ * __gfs2_lookup - Look up a filename in a directory and return its inode
* @dir: The directory inode
* @dentry: The dentry of the new inode
- * @nd: passed from Linux VFS, ignored by us
+ * @file: File to be opened
+ * @opened: atomic_open flags
*
- * Called by the VFS layer. Lock dir and call gfs2_lookupi()
*
* Returns: errno
*/
-static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
+static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
+ struct file *file, int *opened)
{
- struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
- if (inode && !IS_ERR(inode)) {
- struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
- struct gfs2_holder gh;
- int error;
- error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
- if (error) {
- iput(inode);
- return ERR_PTR(error);
- }
- gfs2_glock_dq_uninit(&gh);
+ struct inode *inode;
+ struct dentry *d;
+ struct gfs2_holder gh;
+ struct gfs2_glock *gl;
+ int error;
+
+ inode = gfs2_lookupi(dir, &dentry->d_name, 0);
+ if (!inode)
+ return NULL;
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ gl = GFS2_I(inode)->i_gl;
+ error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+ if (error) {
+ iput(inode);
+ return ERR_PTR(error);
}
- return d_splice_alias(inode, dentry);
+
+ d = d_splice_alias(inode, dentry);
+ if (file && S_ISREG(inode->i_mode))
+ error = finish_open(file, dentry, gfs2_open_common, opened);
+
+ gfs2_glock_dq_uninit(&gh);
+ if (error)
+ return ERR_PTR(error);
+ return d;
+}
+
+static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned flags)
+{
+ return __gfs2_lookup(dir, dentry, NULL, NULL);
}
/**
@@ -1069,7 +1105,7 @@ static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
return -ENAMETOOLONG;
- return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
+ return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
}
/**
@@ -1085,7 +1121,7 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct gfs2_sbd *sdp = GFS2_SB(dir);
unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
- return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, dsize, 0);
+ return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
}
/**
@@ -1100,7 +1136,43 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
dev_t dev)
{
- return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
+ return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
+}
+
+/**
+ * gfs2_atomic_open - Atomically open a file
+ * @dir: The directory
+ * @dentry: The proposed new entry
+ * @file: The proposed new struct file
+ * @flags: open flags
+ * @mode: File mode
+ * @opened: Flag to say whether the file has been opened or not
+ *
+ * Returns: error code or 0 for success
+ */
+
+static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
+ struct file *file, unsigned flags,
+ umode_t mode, int *opened)
+{
+ struct dentry *d;
+ bool excl = !!(flags & O_EXCL);
+
+ d = __gfs2_lookup(dir, dentry, file, opened);
+ if (IS_ERR(d))
+ return PTR_ERR(d);
+ if (d == NULL)
+ d = dentry;
+ if (d->d_inode) {
+ if (!(*opened & FILE_OPENED))
+ return finish_no_open(file, d);
+ return 0;
+ }
+
+ if (!(flags & O_CREAT))
+ return -ENOENT;
+
+ return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
}
/*
@@ -1780,6 +1852,7 @@ const struct inode_operations gfs2_dir_iops = {
.removexattr = gfs2_removexattr,
.fiemap = gfs2_fiemap,
.get_acl = gfs2_get_acl,
+ .atomic_open = gfs2_atomic_open,
};
const struct inode_operations gfs2_symlink_iops = {
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index c53c7477f6da..ba4d9492d422 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -109,6 +109,7 @@ extern int gfs2_permission(struct inode *inode, int mask);
extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
+extern int gfs2_open_common(struct inode *inode, struct file *file);
extern const struct inode_operations gfs2_file_iops;
extern const struct inode_operations gfs2_dir_iops;
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-29 15:18:47 +0000