xfs: pnfs block layout support for 3.20-rc1
This update contains the implementation of the PNFS server export methods that enable use of XFS filesystems as a block layout target. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJU58orAAoJEK3oKUf0dfodFyAQAKqC+Iez1rEMr0aW5WzEFjTO gHoBxQgfz/b2gMntPGbcmMnhRV4LL5/anjRMqU3R4uqTPigskI0+ylQakUKoKgZq yV1MnOeZvv4TIqK45uoesO3ractDdcL84HM7vLF/tlgvNMqDLpLiZlHl+1gEWig6 fMXAcpsp7J7XhGsI5dRDtt5sEuWUUeqSvtiZlzponvLJz//J2JfOe/Z0UzkNddQr Ea7BA/ZQuiN2m3GgXykTljt1i7GuA2HCK0oLzgXpsIblrHoYyP67Clf8TnlG4RN3 a4GsdlHd/0FRa0M28eHh5HND89giMiCDcJbESaR5lAiornwzFYaBF/2cj3M8Jbvr Rr9rhMrD2WRL1Z7Kgv8MDiOd9YpTS12VjSv7n5p4Y1H90USJQutaPYuYdAA2/SHn L4iXVJ5szgPKF6QLFAWubVYn/8NeSRU9VDVXrUb/pQsbbF/sfDtVzwQhouwJmQ2z II9nyNwuqev3Os0ODv22YQAGqRkpWN1u/S266AOr7xForCA9ZO31lAYbQ4YS1Gwe Wbvhw3NXRBqfI3ytm7faGnX9D6NaW/2xvkW2odoBH3AiS7mAYN+hzXi4QZgwuPej bbkEJsG4hcyEmUqmy/Bes+jNhiI6h48G9vKxBaurV07vV7kwoDzrYcZAt383sjtg k7kxPPdtQphr+7Ckudtg =ujZQ -----END PGP SIGNATURE----- Merge tag 'xfs-pnfs-for-linus-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs Pull xfs pnfs block layout support from Dave Chinner: "This contains the changes to XFS needed to support the PNFS block layout server that you pulled in through Bruce's NFS server tree merge. I originally thought that I'd need to merge changes into the NFS server side, but Bruce had already picked them up and so this is purely changes to the fs/xfs/ codebase. Summary: This update contains the implementation of the PNFS server export methods that enable use of XFS filesystems as a block layout target" * tag 'xfs-pnfs-for-linus-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs: xfs: recall pNFS layouts on conflicting access xfs: implement pNFS export operations
This commit is contained in:
commit
93aaa830fc
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@ -121,3 +121,4 @@ xfs-$(CONFIG_XFS_POSIX_ACL) += xfs_acl.o
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xfs-$(CONFIG_PROC_FS) += xfs_stats.o
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xfs-$(CONFIG_SYSCTL) += xfs_sysctl.o
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xfs-$(CONFIG_COMPAT) += xfs_ioctl32.o
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xfs-$(CONFIG_NFSD_PNFS) += xfs_pnfs.o
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@ -30,6 +30,7 @@
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_log.h"
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#include "xfs_pnfs.h"
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/*
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* Note that we only accept fileids which are long enough rather than allow
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@ -245,4 +246,9 @@ const struct export_operations xfs_export_operations = {
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.fh_to_parent = xfs_fs_fh_to_parent,
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.get_parent = xfs_fs_get_parent,
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.commit_metadata = xfs_fs_nfs_commit_metadata,
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#ifdef CONFIG_NFSD_PNFS
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.get_uuid = xfs_fs_get_uuid,
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.map_blocks = xfs_fs_map_blocks,
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.commit_blocks = xfs_fs_commit_blocks,
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#endif
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};
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@ -36,6 +36,7 @@
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#include "xfs_trace.h"
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#include "xfs_log.h"
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#include "xfs_icache.h"
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#include "xfs_pnfs.h"
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#include <linux/aio.h>
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#include <linux/dcache.h>
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@ -554,6 +555,10 @@ restart:
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if (error)
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return error;
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error = xfs_break_layouts(inode, iolock);
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if (error)
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return error;
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/*
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* If the offset is beyond the size of the file, we need to zero any
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* blocks that fall between the existing EOF and the start of this
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@ -822,6 +827,7 @@ xfs_file_fallocate(
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struct xfs_inode *ip = XFS_I(inode);
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long error;
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enum xfs_prealloc_flags flags = 0;
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uint iolock = XFS_IOLOCK_EXCL;
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loff_t new_size = 0;
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if (!S_ISREG(inode->i_mode))
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@ -830,7 +836,11 @@ xfs_file_fallocate(
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FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
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return -EOPNOTSUPP;
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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xfs_ilock(ip, iolock);
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error = xfs_break_layouts(inode, &iolock);
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if (error)
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goto out_unlock;
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if (mode & FALLOC_FL_PUNCH_HOLE) {
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error = xfs_free_file_space(ip, offset, len);
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if (error)
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@ -894,7 +904,7 @@ xfs_file_fallocate(
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}
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out_unlock:
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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xfs_iunlock(ip, iolock);
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return error;
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}
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@ -602,6 +602,12 @@ xfs_growfs_data(
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if (!mutex_trylock(&mp->m_growlock))
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return -EWOULDBLOCK;
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error = xfs_growfs_data_private(mp, in);
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/*
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* Increment the generation unconditionally, the error could be from
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* updating the secondary superblocks, in which case the new size
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* is live already.
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*/
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mp->m_generation++;
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mutex_unlock(&mp->m_growlock);
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return error;
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}
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@ -39,6 +39,7 @@
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#include "xfs_icache.h"
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#include "xfs_symlink.h"
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#include "xfs_trans.h"
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#include "xfs_pnfs.h"
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#include <linux/capability.h>
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#include <linux/dcache.h>
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@ -608,6 +609,7 @@ xfs_ioc_space(
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{
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struct iattr iattr;
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enum xfs_prealloc_flags flags = 0;
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uint iolock = XFS_IOLOCK_EXCL;
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int error;
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/*
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@ -636,7 +638,10 @@ xfs_ioc_space(
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if (error)
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return error;
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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xfs_ilock(ip, iolock);
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error = xfs_break_layouts(inode, &iolock);
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if (error)
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goto out_unlock;
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switch (bf->l_whence) {
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case 0: /*SEEK_SET*/
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@ -725,7 +730,7 @@ xfs_ioc_space(
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error = xfs_update_prealloc_flags(ip, flags);
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out_unlock:
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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xfs_iunlock(ip, iolock);
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mnt_drop_write_file(filp);
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return error;
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}
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@ -37,6 +37,7 @@
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#include "xfs_da_btree.h"
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#include "xfs_dir2.h"
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#include "xfs_trans_space.h"
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#include "xfs_pnfs.h"
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#include <linux/capability.h>
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#include <linux/xattr.h>
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@ -505,7 +506,7 @@ xfs_setattr_mode(
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inode->i_mode |= mode & ~S_IFMT;
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}
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static void
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void
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xfs_setattr_time(
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struct xfs_inode *ip,
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struct iattr *iattr)
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@ -979,9 +980,13 @@ xfs_vn_setattr(
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int error;
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if (iattr->ia_valid & ATTR_SIZE) {
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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error = xfs_setattr_size(ip, iattr);
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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uint iolock = XFS_IOLOCK_EXCL;
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xfs_ilock(ip, iolock);
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error = xfs_break_layouts(dentry->d_inode, &iolock);
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if (!error)
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error = xfs_setattr_size(ip, iattr);
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xfs_iunlock(ip, iolock);
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} else {
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error = xfs_setattr_nonsize(ip, iattr, 0);
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}
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@ -32,6 +32,7 @@ extern void xfs_setup_inode(struct xfs_inode *);
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*/
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#define XFS_ATTR_NOACL 0x01 /* Don't call posix_acl_chmod */
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extern void xfs_setattr_time(struct xfs_inode *ip, struct iattr *iattr);
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extern int xfs_setattr_nonsize(struct xfs_inode *ip, struct iattr *vap,
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int flags);
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extern int xfs_setattr_size(struct xfs_inode *ip, struct iattr *vap);
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@ -174,6 +174,17 @@ typedef struct xfs_mount {
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struct workqueue_struct *m_reclaim_workqueue;
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struct workqueue_struct *m_log_workqueue;
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struct workqueue_struct *m_eofblocks_workqueue;
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/*
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* Generation of the filesysyem layout. This is incremented by each
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* growfs, and used by the pNFS server to ensure the client updates
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* its view of the block device once it gets a layout that might
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* reference the newly added blocks. Does not need to be persistent
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* as long as we only allow file system size increments, but if we
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* ever support shrinks it would have to be persisted in addition
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* to various other kinds of pain inflicted on the pNFS server.
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*/
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__uint32_t m_generation;
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} xfs_mount_t;
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/*
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322
fs/xfs/xfs_pnfs.c
Normal file
322
fs/xfs/xfs_pnfs.c
Normal file
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@ -0,0 +1,322 @@
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/*
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* Copyright (c) 2014 Christoph Hellwig.
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*/
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#include "xfs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_log.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_error.h"
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#include "xfs_iomap.h"
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#include "xfs_shared.h"
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#include "xfs_bit.h"
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#include "xfs_pnfs.h"
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/*
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* Ensure that we do not have any outstanding pNFS layouts that can be used by
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* clients to directly read from or write to this inode. This must be called
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* before every operation that can remove blocks from the extent map.
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* Additionally we call it during the write operation, where aren't concerned
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* about exposing unallocated blocks but just want to provide basic
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* synchronization between a local writer and pNFS clients. mmap writes would
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* also benefit from this sort of synchronization, but due to the tricky locking
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* rules in the page fault path we don't bother.
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*/
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int
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xfs_break_layouts(
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struct inode *inode,
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uint *iolock)
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{
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struct xfs_inode *ip = XFS_I(inode);
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int error;
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ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
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while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
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xfs_iunlock(ip, *iolock);
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error = break_layout(inode, true);
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*iolock = XFS_IOLOCK_EXCL;
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xfs_ilock(ip, *iolock);
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}
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return error;
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}
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/*
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* Get a unique ID including its location so that the client can identify
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* the exported device.
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*/
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int
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xfs_fs_get_uuid(
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struct super_block *sb,
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u8 *buf,
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u32 *len,
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u64 *offset)
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{
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struct xfs_mount *mp = XFS_M(sb);
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printk_once(KERN_NOTICE
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"XFS (%s): using experimental pNFS feature, use at your own risk!\n",
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mp->m_fsname);
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if (*len < sizeof(uuid_t))
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return -EINVAL;
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memcpy(buf, &mp->m_sb.sb_uuid, sizeof(uuid_t));
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*len = sizeof(uuid_t);
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*offset = offsetof(struct xfs_dsb, sb_uuid);
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return 0;
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}
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|
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static void
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xfs_bmbt_to_iomap(
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struct xfs_inode *ip,
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struct iomap *iomap,
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struct xfs_bmbt_irec *imap)
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{
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struct xfs_mount *mp = ip->i_mount;
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if (imap->br_startblock == HOLESTARTBLOCK) {
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iomap->blkno = IOMAP_NULL_BLOCK;
|
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iomap->type = IOMAP_HOLE;
|
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} else if (imap->br_startblock == DELAYSTARTBLOCK) {
|
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iomap->blkno = IOMAP_NULL_BLOCK;
|
||||
iomap->type = IOMAP_DELALLOC;
|
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} else {
|
||||
iomap->blkno =
|
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XFS_FSB_TO_DADDR(ip->i_mount, imap->br_startblock);
|
||||
if (imap->br_state == XFS_EXT_UNWRITTEN)
|
||||
iomap->type = IOMAP_UNWRITTEN;
|
||||
else
|
||||
iomap->type = IOMAP_MAPPED;
|
||||
}
|
||||
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
|
||||
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
|
||||
}
|
||||
|
||||
/*
|
||||
* Get a layout for the pNFS client.
|
||||
*/
|
||||
int
|
||||
xfs_fs_map_blocks(
|
||||
struct inode *inode,
|
||||
loff_t offset,
|
||||
u64 length,
|
||||
struct iomap *iomap,
|
||||
bool write,
|
||||
u32 *device_generation)
|
||||
{
|
||||
struct xfs_inode *ip = XFS_I(inode);
|
||||
struct xfs_mount *mp = ip->i_mount;
|
||||
struct xfs_bmbt_irec imap;
|
||||
xfs_fileoff_t offset_fsb, end_fsb;
|
||||
loff_t limit;
|
||||
int bmapi_flags = XFS_BMAPI_ENTIRE;
|
||||
int nimaps = 1;
|
||||
uint lock_flags;
|
||||
int error = 0;
|
||||
|
||||
if (XFS_FORCED_SHUTDOWN(mp))
|
||||
return -EIO;
|
||||
|
||||
/*
|
||||
* We can't export inodes residing on the realtime device. The realtime
|
||||
* device doesn't have a UUID to identify it, so the client has no way
|
||||
* to find it.
|
||||
*/
|
||||
if (XFS_IS_REALTIME_INODE(ip))
|
||||
return -ENXIO;
|
||||
|
||||
/*
|
||||
* Lock out any other I/O before we flush and invalidate the pagecache,
|
||||
* and then hand out a layout to the remote system. This is very
|
||||
* similar to direct I/O, except that the synchronization is much more
|
||||
* complicated. See the comment near xfs_break_layouts for a detailed
|
||||
* explanation.
|
||||
*/
|
||||
xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
||||
|
||||
error = -EINVAL;
|
||||
limit = mp->m_super->s_maxbytes;
|
||||
if (!write)
|
||||
limit = max(limit, round_up(i_size_read(inode),
|
||||
inode->i_sb->s_blocksize));
|
||||
if (offset > limit)
|
||||
goto out_unlock;
|
||||
if (offset > limit - length)
|
||||
length = limit - offset;
|
||||
|
||||
error = filemap_write_and_wait(inode->i_mapping);
|
||||
if (error)
|
||||
goto out_unlock;
|
||||
error = invalidate_inode_pages2(inode->i_mapping);
|
||||
if (WARN_ON_ONCE(error))
|
||||
return error;
|
||||
|
||||
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + length);
|
||||
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
||||
|
||||
lock_flags = xfs_ilock_data_map_shared(ip);
|
||||
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
|
||||
&imap, &nimaps, bmapi_flags);
|
||||
xfs_iunlock(ip, lock_flags);
|
||||
|
||||
if (error)
|
||||
goto out_unlock;
|
||||
|
||||
if (write) {
|
||||
enum xfs_prealloc_flags flags = 0;
|
||||
|
||||
ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
|
||||
|
||||
if (!nimaps || imap.br_startblock == HOLESTARTBLOCK) {
|
||||
error = xfs_iomap_write_direct(ip, offset, length,
|
||||
&imap, nimaps);
|
||||
if (error)
|
||||
goto out_unlock;
|
||||
|
||||
/*
|
||||
* Ensure the next transaction is committed
|
||||
* synchronously so that the blocks allocated and
|
||||
* handed out to the client are guaranteed to be
|
||||
* present even after a server crash.
|
||||
*/
|
||||
flags |= XFS_PREALLOC_SET | XFS_PREALLOC_SYNC;
|
||||
}
|
||||
|
||||
error = xfs_update_prealloc_flags(ip, flags);
|
||||
if (error)
|
||||
goto out_unlock;
|
||||
}
|
||||
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
||||
|
||||
xfs_bmbt_to_iomap(ip, iomap, &imap);
|
||||
*device_generation = mp->m_generation;
|
||||
return error;
|
||||
out_unlock:
|
||||
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Ensure the size update falls into a valid allocated block.
|
||||
*/
|
||||
static int
|
||||
xfs_pnfs_validate_isize(
|
||||
struct xfs_inode *ip,
|
||||
xfs_off_t isize)
|
||||
{
|
||||
struct xfs_bmbt_irec imap;
|
||||
int nimaps = 1;
|
||||
int error = 0;
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
||||
error = xfs_bmapi_read(ip, XFS_B_TO_FSBT(ip->i_mount, isize - 1), 1,
|
||||
&imap, &nimaps, 0);
|
||||
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
if (imap.br_startblock == HOLESTARTBLOCK ||
|
||||
imap.br_startblock == DELAYSTARTBLOCK ||
|
||||
imap.br_state == XFS_EXT_UNWRITTEN)
|
||||
return -EIO;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Make sure the blocks described by maps are stable on disk. This includes
|
||||
* converting any unwritten extents, flushing the disk cache and updating the
|
||||
* time stamps.
|
||||
*
|
||||
* Note that we rely on the caller to always send us a timestamp update so that
|
||||
* we always commit a transaction here. If that stops being true we will have
|
||||
* to manually flush the cache here similar to what the fsync code path does
|
||||
* for datasyncs on files that have no dirty metadata.
|
||||
*/
|
||||
int
|
||||
xfs_fs_commit_blocks(
|
||||
struct inode *inode,
|
||||
struct iomap *maps,
|
||||
int nr_maps,
|
||||
struct iattr *iattr)
|
||||
{
|
||||
struct xfs_inode *ip = XFS_I(inode);
|
||||
struct xfs_mount *mp = ip->i_mount;
|
||||
struct xfs_trans *tp;
|
||||
bool update_isize = false;
|
||||
int error, i;
|
||||
loff_t size;
|
||||
|
||||
ASSERT(iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME));
|
||||
|
||||
xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
||||
|
||||
size = i_size_read(inode);
|
||||
if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size > size) {
|
||||
update_isize = true;
|
||||
size = iattr->ia_size;
|
||||
}
|
||||
|
||||
for (i = 0; i < nr_maps; i++) {
|
||||
u64 start, length, end;
|
||||
|
||||
start = maps[i].offset;
|
||||
if (start > size)
|
||||
continue;
|
||||
|
||||
end = start + maps[i].length;
|
||||
if (end > size)
|
||||
end = size;
|
||||
|
||||
length = end - start;
|
||||
if (!length)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* Make sure reads through the pagecache see the new data.
|
||||
*/
|
||||
error = invalidate_inode_pages2_range(inode->i_mapping,
|
||||
start >> PAGE_CACHE_SHIFT,
|
||||
(end - 1) >> PAGE_CACHE_SHIFT);
|
||||
WARN_ON_ONCE(error);
|
||||
|
||||
error = xfs_iomap_write_unwritten(ip, start, length);
|
||||
if (error)
|
||||
goto out_drop_iolock;
|
||||
}
|
||||
|
||||
if (update_isize) {
|
||||
error = xfs_pnfs_validate_isize(ip, size);
|
||||
if (error)
|
||||
goto out_drop_iolock;
|
||||
}
|
||||
|
||||
tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
|
||||
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
|
||||
if (error)
|
||||
goto out_drop_iolock;
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
||||
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
||||
|
||||
xfs_setattr_time(ip, iattr);
|
||||
if (update_isize) {
|
||||
i_size_write(inode, iattr->ia_size);
|
||||
ip->i_d.di_size = iattr->ia_size;
|
||||
}
|
||||
|
||||
xfs_trans_set_sync(tp);
|
||||
error = xfs_trans_commit(tp, 0);
|
||||
|
||||
out_drop_iolock:
|
||||
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
||||
return error;
|
||||
}
|
18
fs/xfs/xfs_pnfs.h
Normal file
18
fs/xfs/xfs_pnfs.h
Normal file
|
@ -0,0 +1,18 @@
|
|||
#ifndef _XFS_PNFS_H
|
||||
#define _XFS_PNFS_H 1
|
||||
|
||||
#ifdef CONFIG_NFSD_PNFS
|
||||
int xfs_fs_get_uuid(struct super_block *sb, u8 *buf, u32 *len, u64 *offset);
|
||||
int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
|
||||
struct iomap *iomap, bool write, u32 *device_generation);
|
||||
int xfs_fs_commit_blocks(struct inode *inode, struct iomap *maps, int nr_maps,
|
||||
struct iattr *iattr);
|
||||
|
||||
int xfs_break_layouts(struct inode *inode, uint *iolock);
|
||||
#else
|
||||
static inline int xfs_break_layouts(struct inode *inode, uint *iolock)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif /* CONFIG_NFSD_PNFS */
|
||||
#endif /* _XFS_PNFS_H */
|
Loading…
Reference in a new issue