[PATCH 19/22] xfs: get rid of xfs_dir_ialloc()

Dave Chinner
2021-05-06T07:21:06Z

From: Dave Chinner <dchinner@redhat.com>

This is just a simple wrapper around the per-ag inode allocation
that doesn't need to exist. The internal mechanism to select and
allocate within an AG does not need to be exposed outside
xfs_ialloc.c, and it being exposed simply makes it harder to follow
the code and simplify it.

This is simplified by internalising xf_dialloc_select_ag() and
xfs_dialloc_ag() into a single xfs_dialloc() function and then
xfs_dir_ialloc() can go away.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/libxfs/xfs_ialloc.c | 15 +++++----
fs/xfs/libxfs/xfs_ialloc.h | 27 +++-------------
fs/xfs/xfs_inode.c | 66 +++++++-------------------------------
fs/xfs/xfs_inode.h | 9 +++---
fs/xfs/xfs_qm.c | 9 ++++--
fs/xfs/xfs_symlink.c | 9 ++++--
6 files changed, 43 insertions(+), 92 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index b22556556bba..2c0ef2dd46d9 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1602,24 +1602,23 @@ xfs_ialloc_next_ag(
* can be allocated, -ENOSPC be returned.
*/
int
-xfs_dialloc_select_ag(
+xfs_dialloc(
struct xfs_trans **tpp,
xfs_ino_t parent,
umode_t mode,
- struct xfs_buf **IO_agbp)
+ xfs_ino_t *new_ino)
{
struct xfs_mount *mp = (*tpp)->t_mountp;
struct xfs_buf *agbp;
xfs_agnumber_t agno;
- int error;
+ int error = 0;
xfs_agnumber_t start_agno;
struct xfs_perag *pag;
struct xfs_ino_geometry *igeo = M_IGEO(mp);
bool okalloc = true;
int needspace;
int flags;
-
- *IO_agbp = NULL;
+ xfs_ino_t ino;

/*
* Files of these types need at least one block if length > 0
@@ -1763,7 +1762,11 @@ xfs_dialloc_select_ag(
return error ? error : -ENOSPC;
found_ag:
xfs_perag_put(pag);
- *IO_agbp = agbp;
+ /* Allocate an inode in the found AG */
+ error = xfs_dialloc_ag(*tpp, agbp, parent, &ino);
+ if (error)
+ return error;
+ *new_ino = ino;
return 0;
}

diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h
index 3511086a7ae1..886f6748fb22 100644
--- a/fs/xfs/libxfs/xfs_ialloc.h
+++ b/fs/xfs/libxfs/xfs_ialloc.h
@@ -33,30 +33,11 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
}

/*
- * Allocate an inode on disk.
- * Mode is used to tell whether the new inode will need space, and whether
- * it is a directory.
- *
- * There are two phases to inode allocation: selecting an AG and ensuring
- * that it contains free inodes, followed by allocating one of the free
- * inodes. xfs_dialloc_select_ag() does the former and returns a locked AGI
- * to the caller, ensuring that followup call to xfs_dialloc_ag() will
- * have free inodes to allocate from. xfs_dialloc_ag() will return the inode
- * number of the free inode we allocated.
+ * Allocate an inode on disk. Mode is used to tell whether the new inode will
+ * need space, and whether it is a directory.
*/
-int /* error */
-xfs_dialloc_select_ag(
- struct xfs_trans **tpp, /* double pointer of transaction */
- xfs_ino_t parent, /* parent inode (directory) */
- umode_t mode, /* mode bits for new inode */
- struct xfs_buf **IO_agbp);
-
-int
-xfs_dialloc_ag(
- struct xfs_trans *tp,
- struct xfs_buf *agbp,
- xfs_ino_t parent,
- xfs_ino_t *inop);
+int xfs_dialloc(struct xfs_trans **tpp, xfs_ino_t parent, umode_t mode,
+ xfs_ino_t *new_ino);

/*
* Free disk inode. Carefully avoids touching the incore inode, all
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 3918c99fa95b..26668b6846e2 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -749,7 +749,7 @@ xfs_inode_inherit_flags2(
* Initialise a newly allocated inode and return the in-core inode to the
* caller locked exclusively.
*/
-static int
+int
xfs_init_new_inode(
struct user_namespace *mnt_userns,
struct xfs_trans *tp,
@@ -885,54 +885,6 @@ xfs_init_new_inode(
return 0;
}

-/*
- * Allocates a new inode from disk and return a pointer to the incore copy. This
- * routine will internally commit the current transaction and allocate a new one
- * if we needed to allocate more on-disk free inodes to perform the requested
- * operation.
- *
- * If we are allocating quota inodes, we do not have a parent inode to attach to
- * or associate with (i.e. dp == NULL) because they are not linked into the
- * directory structure - they are attached directly to the superblock - and so
- * have no parent.
- */
-int
-xfs_dir_ialloc(
- struct user_namespace *mnt_userns,
- struct xfs_trans **tpp,
- struct xfs_inode *dp,
- umode_t mode,
- xfs_nlink_t nlink,
- dev_t rdev,
- prid_t prid,
- bool init_xattrs,
- struct xfs_inode **ipp)
-{
- struct xfs_buf *agibp;
- xfs_ino_t parent_ino = dp ? dp->i_ino : 0;
- xfs_ino_t ino;
- int error;
-
- ASSERT((*tpp)->t_flags & XFS_TRANS_PERM_LOG_RES);
-
- /*
- * Call the space management code to pick the on-disk inode to be
- * allocated.
- */
- error = xfs_dialloc_select_ag(tpp, parent_ino, mode, &agibp);
- if (error)
- return error;
-
- /* Allocate an inode from the selected AG */
- error = xfs_dialloc_ag(*tpp, agibp, parent_ino, &ino);
- if (error)
- return error;
- ASSERT(ino != NULLFSINO);
-
- return xfs_init_new_inode(mnt_userns, *tpp, dp, ino, mode, nlink, rdev,
- prid, init_xattrs, ipp);
-}
-
/*
* Decrement the link count on an inode & log the change. If this causes the
* link count to go to zero, move the inode to AGI unlinked list so that it can
@@ -990,6 +942,7 @@ xfs_create(
struct xfs_dquot *pdqp = NULL;
struct xfs_trans_res *tres;
uint resblks;
+ xfs_ino_t ino;

trace_xfs_create(dp, name);

@@ -1046,14 +999,16 @@ xfs_create(
* entry pointing to them, but a directory also the "." entry
* pointing to itself.
*/
- error = xfs_dir_ialloc(mnt_userns, &tp, dp, mode, is_dir ? 2 : 1, rdev,
- prid, init_xattrs, &ip);
+ error = xfs_dialloc(&tp, dp->i_ino, mode, &ino);
+ if (!error)
+ error = xfs_init_new_inode(mnt_userns, tp, dp, ino, mode,
+ is_dir ? 2 : 1, rdev, prid, init_xattrs, &ip);
if (error)
goto out_trans_cancel;

/*
* Now we join the directory inode to the transaction. We do not do it
- * earlier because xfs_dir_ialloc might commit the previous transaction
+ * earlier because xfs_dialloc might commit the previous transaction
* (and release all the locks). An error from here on will result in
* the transaction cancel unlocking dp so don't do it explicitly in the
* error path.
@@ -1143,6 +1098,7 @@ xfs_create_tmpfile(
struct xfs_dquot *pdqp = NULL;
struct xfs_trans_res *tres;
uint resblks;
+ xfs_ino_t ino;

if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
@@ -1167,8 +1123,10 @@ xfs_create_tmpfile(
if (error)
goto out_release_dquots;

- error = xfs_dir_ialloc(mnt_userns, &tp, dp, mode, 0, 0, prid,
- false, &ip);
+ error = xfs_dialloc(&tp, dp->i_ino, mode, &ino);
+ if (!error)
+ error = xfs_init_new_inode(mnt_userns, tp, dp, ino, mode,
+ 0, 0, prid, false, &ip);
if (error)
goto out_trans_cancel;

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index ca826cfba91c..4b6703dbffb8 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -431,11 +431,10 @@ void xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip);

-int xfs_dir_ialloc(struct user_namespace *mnt_userns,
- struct xfs_trans **tpp, struct xfs_inode *dp,
- umode_t mode, xfs_nlink_t nlink, dev_t dev,
- prid_t prid, bool need_xattr,
- struct xfs_inode **ipp);
+int xfs_init_new_inode(struct user_namespace *mnt_userns, struct xfs_trans *tp,
+ struct xfs_inode *pip, xfs_ino_t ino, umode_t mode,
+ xfs_nlink_t nlink, dev_t rdev, prid_t prid, bool init_xattrs,
+ struct xfs_inode **ipp);

static inline int
xfs_itruncate_extents(
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index f7baf4dc2554..fe341f3fd419 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -24,6 +24,7 @@
#include "xfs_icache.h"
#include "xfs_error.h"
#include "xfs_ag.h"
+#include "xfs_ialloc.h"

/*
* The global quota manager. There is only one of these for the entire
@@ -788,8 +789,12 @@ xfs_qm_qino_alloc(
return error;

if (need_alloc) {
- error = xfs_dir_ialloc(&init_user_ns, &tp, NULL, S_IFREG, 1, 0,
- 0, false, ipp);
+ xfs_ino_t ino;
+
+ error = xfs_dialloc(&tp, 0, S_IFREG, &ino);
+ if (!error)
+ error = xfs_init_new_inode(&init_user_ns, tp, NULL, ino,
+ S_IFREG, 1, 0, 0, false, ipp);
if (error) {
xfs_trans_cancel(tp);
return error;
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index b4fa70282383..44596c31f4c9 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -21,6 +21,7 @@
#include "xfs_trans_space.h"
#include "xfs_trace.h"
#include "xfs_trans.h"
+#include "xfs_ialloc.h"

/* ----- Kernel only functions below ----- */
int
@@ -161,6 +162,7 @@ xfs_symlink(
struct xfs_dquot *gdqp = NULL;
struct xfs_dquot *pdqp = NULL;
uint resblks;
+ xfs_ino_t ino;

*ipp = NULL;

@@ -223,8 +225,11 @@ xfs_symlink(
/*
* Allocate an inode for the symlink.
*/
- error = xfs_dir_ialloc(mnt_userns, &tp, dp, S_IFLNK | (mode & ~S_IFMT),
- 1, 0, prid, false, &ip);
+ error = xfs_dialloc(&tp, dp->i_ino, S_IFLNK, &ino);
+ if (!error)
+ error = xfs_init_new_inode(mnt_userns, tp, dp, ino,
+ S_IFLNK | (mode & ~S_IFMT), 1, 0, prid,
+ false, &ip);
if (error)
goto out_trans_cancel;

--
2.31.1