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VFS: Split DCACHE_FILE_TYPE into regular and special types 

Split DCACHE_FILE_TYPE into DCACHE_REGULAR_TYPE (dentries representing regular
files) and DCACHE_SPECIAL_TYPE (representing blockdev, chardev, FIFO and
socket files).

d_is_reg() and d_is_special() are added to detect these subtypes and
d_is_file() is left as the union of the two.

This allows a number of places that use S_ISREG(dentry->d_inode->i_mode) to
use d_is_reg(dentry) instead.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2015-01-29 12:02:29 +00:00 committed by Al Viro
parent df1a085af1
commit 44bdb5e5f6
2 changed files with 28 additions and 9 deletions
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20
fs/dcache.c
View File

@ -1677,7 +1677,7 @@ EXPORT_SYMBOL(d_set_fallthru);
static unsigned d_flags_for_inode(struct inode *inode)
{
unsigned add_flags = DCACHE_FILE_TYPE;
unsigned add_flags = DCACHE_REGULAR_TYPE;
if (!inode)
return DCACHE_MISS_TYPE;
@ -1690,13 +1690,21 @@ static unsigned d_flags_for_inode(struct inode *inode)
else
inode->i_opflags |= IOP_LOOKUP;
}
} else if (unlikely(!(inode->i_opflags & IOP_NOFOLLOW))) {
if (unlikely(inode->i_op->follow_link))
add_flags = DCACHE_SYMLINK_TYPE;
else
inode->i_opflags |= IOP_NOFOLLOW;
goto type_determined;
}
if (unlikely(!(inode->i_opflags & IOP_NOFOLLOW))) {
if (unlikely(inode->i_op->follow_link)) {
add_flags = DCACHE_SYMLINK_TYPE;
goto type_determined;
}
inode->i_opflags |= IOP_NOFOLLOW;
}
if (unlikely(!S_ISREG(inode->i_mode)))
add_flags = DCACHE_SPECIAL_TYPE;
type_determined:
if (unlikely(IS_AUTOMOUNT(inode)))
add_flags |= DCACHE_NEED_AUTOMOUNT;
return add_flags;

17
include/linux/dcache.h
View File

@ -219,8 +219,9 @@ struct dentry_operations {
#define DCACHE_WHITEOUT_TYPE 0x00100000 /* Whiteout dentry (stop pathwalk) */
#define DCACHE_DIRECTORY_TYPE 0x00200000 /* Normal directory */
#define DCACHE_AUTODIR_TYPE 0x00300000 /* Lookupless directory (presumed automount) */
#define DCACHE_SYMLINK_TYPE 0x00400000 /* Symlink (or fallthru to such) */
#define DCACHE_FILE_TYPE 0x00500000 /* Other file type (or fallthru to such) */
#define DCACHE_REGULAR_TYPE 0x00400000 /* Regular file type (or fallthru to such) */
#define DCACHE_SPECIAL_TYPE 0x00500000 /* Other file type (or fallthru to such) */
#define DCACHE_SYMLINK_TYPE 0x00600000 /* Symlink (or fallthru to such) */
#define DCACHE_MAY_FREE 0x00800000
#define DCACHE_FALLTHRU 0x01000000 /* Fall through to lower layer */
@ -455,9 +456,19 @@ static inline bool d_is_symlink(const struct dentry *dentry)
return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE;
}
static inline bool d_is_reg(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_REGULAR_TYPE;
}
static inline bool d_is_special(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_SPECIAL_TYPE;
}
static inline bool d_is_file(const struct dentry *dentry)
{
return __d_entry_type(dentry) == DCACHE_FILE_TYPE;
return d_is_reg(dentry) || d_is_special(dentry);
}
static inline bool d_is_negative(const struct dentry *dentry)