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fsnotify: factor helpers fsnotify_dentry() and fsnotify_file()

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Most of the code in fsnotify hooks is boiler plate of one or the other.

Link: https://lore.kernel.org/r/20200319151022.31456-3-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2020-03-19 17:10:10 +02:00 committed by Jan Kara
parent 6473ea760c
commit eae36a2b83
1 changed files with 37 additions and 62 deletions
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99
include/linux/fsnotify.h
View file

@ -41,16 +41,36 @@ static inline int fsnotify_parent(const struct path *path,
}
/*
* Simple wrapper to consolidate calls fsnotify_parent()/fsnotify() when
* an event is on a path.
* Simple wrappers to consolidate calls fsnotify_parent()/fsnotify() when
* an event is on a file/dentry.
*/
static inline int fsnotify_path(struct inode *inode, const struct path *path,
__u32 mask)
static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
{
int ret = fsnotify_parent(path, NULL, mask);
struct inode *inode = d_inode(dentry);
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
fsnotify_parent(NULL, dentry, mask);
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
}
static inline int fsnotify_file(struct file *file, __u32 mask)
{
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
int ret;
if (file->f_mode & FMODE_NONOTIFY)
return 0;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
ret = fsnotify_parent(path, NULL, mask);
if (ret)
return ret;
return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
}
@ -58,19 +78,16 @@ static inline int fsnotify_path(struct inode *inode, const struct path *path,
static inline int fsnotify_perm(struct file *file, int mask)
{
int ret;
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
__u32 fsnotify_mask = 0;
if (file->f_mode & FMODE_NONOTIFY)
return 0;
if (!(mask & (MAY_READ | MAY_OPEN)))
return 0;
if (mask & MAY_OPEN) {
fsnotify_mask = FS_OPEN_PERM;
if (file->f_flags & __FMODE_EXEC) {
ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM);
ret = fsnotify_file(file, FS_OPEN_EXEC_PERM);
if (ret)
return ret;
@ -79,10 +96,7 @@ static inline int fsnotify_perm(struct file *file, int mask)
fsnotify_mask = FS_ACCESS_PERM;
}
if (S_ISDIR(inode->i_mode))
fsnotify_mask |= FS_ISDIR;
return fsnotify_path(inode, path, fsnotify_mask);
return fsnotify_file(file, fsnotify_mask);
}
/*
@ -229,15 +243,7 @@ static inline void fsnotify_rmdir(struct inode *dir, struct dentry *dentry)
*/
static inline void fsnotify_access(struct file *file)
{
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
__u32 mask = FS_ACCESS;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
if (!(file->f_mode & FMODE_NONOTIFY))
fsnotify_path(inode, path, mask);
fsnotify_file(file, FS_ACCESS);
}
/*
@ -245,15 +251,7 @@ static inline void fsnotify_access(struct file *file)
*/
static inline void fsnotify_modify(struct file *file)
{
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
__u32 mask = FS_MODIFY;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
if (!(file->f_mode & FMODE_NONOTIFY))
fsnotify_path(inode, path, mask);
fsnotify_file(file, FS_MODIFY);
}
/*
@ -261,16 +259,12 @@ static inline void fsnotify_modify(struct file *file)
*/
static inline void fsnotify_open(struct file *file)
{
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
__u32 mask = FS_OPEN;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
if (file->f_flags & __FMODE_EXEC)
mask |= FS_OPEN_EXEC;
fsnotify_path(inode, path, mask);
fsnotify_file(file, mask);
}
/*
@ -278,16 +272,10 @@ static inline void fsnotify_open(struct file *file)
*/
static inline void fsnotify_close(struct file *file)
{
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
fmode_t mode = file->f_mode;
__u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
__u32 mask = (file->f_mode & FMODE_WRITE) ? FS_CLOSE_WRITE :
FS_CLOSE_NOWRITE;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
if (!(file->f_mode & FMODE_NONOTIFY))
fsnotify_path(inode, path, mask);
fsnotify_file(file, mask);
}
/*
@ -295,14 +283,7 @@ static inline void fsnotify_close(struct file *file)
*/
static inline void fsnotify_xattr(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
__u32 mask = FS_ATTRIB;
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
fsnotify_parent(NULL, dentry, mask);
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
fsnotify_dentry(dentry, FS_ATTRIB);
}
/*
@ -311,7 +292,6 @@ static inline void fsnotify_xattr(struct dentry *dentry)
*/
static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
{
struct inode *inode = dentry->d_inode;
__u32 mask = 0;
if (ia_valid & ATTR_UID)
@ -332,13 +312,8 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
if (ia_valid & ATTR_MODE)
mask |= FS_ATTRIB;
if (mask) {
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
fsnotify_parent(NULL, dentry, mask);
fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
}
if (mask)
fsnotify_dentry(dentry, mask);
}
#endif /* _LINUX_FS_NOTIFY_H */