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mirror O_APPEND and O_DIRECT into iocb->ki_flags

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... avoiding write_iter/fcntl races.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2015-04-09 13:52:01 -04:00
parent 3309dd04cb
commit 2ba48ce513
11 changed files with 38 additions and 23 deletions
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15
include/linux/fs.h
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@@ -315,6 +315,8 @@ struct address_space;
struct writeback_control;
#define IOCB_EVENTFD (1 << 0)
#define IOCB_APPEND (1 << 1)
#define IOCB_DIRECT (1 << 2)
struct kiocb {
struct file *ki_filp;
@@ -329,10 +331,13 @@ static inline bool is_sync_kiocb(struct kiocb *kiocb)
return kiocb->ki_complete == NULL;
}
static inline int iocb_flags(struct file *file);
static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
{
*kiocb = (struct kiocb) {
.ki_filp = filp,
.ki_flags = iocb_flags(filp),
};
}
@@ -2779,6 +2784,16 @@ static inline bool io_is_direct(struct file *filp)
return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp));
}
static inline int iocb_flags(struct file *file)
{
int res = 0;
if (file->f_flags & O_APPEND)
res |= IOCB_APPEND;
if (io_is_direct(file))
res |= IOCB_DIRECT;
return res;
}
static inline ino_t parent_ino(struct dentry *dentry)
{
ino_t res;