#include #include #include /* does _NOT_ require i_mutex to be held. * * This function cannot be inlined since i_size_{read,write} is rather * heavy-weight on 32-bit systems */ void fsstack_copy_inode_size(struct inode *dst, struct inode *src) { loff_t i_size; blkcnt_t i_blocks; /* * i_size_read() includes its own seqlocking and protection from * preemption (see include/linux/fs.h): we need nothing extra for * that here, and prefer to avoid nesting locks than attempt to keep * i_size and i_blocks in sync together. */ i_size = i_size_read(src); /* * But if CONFIG_LBDAF (on 32-bit), we ought to make an effort to * keep the two halves of i_blocks in sync despite SMP or PREEMPT - * though stat's generic_fillattr() doesn't bother, and we won't be * applying quotas (where i_blocks does become important) at the * upper level. * * We don't actually know what locking is used at the lower level; * but if it's a filesystem that supports quotas, it will be using * i_lock as in inode_add_bytes(). */ if (sizeof(i_blocks) > sizeof(long)) spin_lock(&src->i_lock); i_blocks = src->i_blocks; if (sizeof(i_blocks) > sizeof(long)) spin_unlock(&src->i_lock); /* * If CONFIG_SMP or CONFIG_PREEMPT on 32-bit, it's vital for * fsstack_copy_inode_size() to hold some lock around * i_size_write(), otherwise i_size_read() may spin forever (see * include/linux/fs.h). We don't necessarily hold i_mutex when this * is called, so take i_lock for that case. * * And if CONFIG_LBDAF (on 32-bit), continue our effort to keep the * two halves of i_blocks in sync despite SMP or PREEMPT: use i_lock * for that case too, and do both at once by combining the tests. * * There is none of this locking overhead in the 64-bit case. */ if (sizeof(i_size) > sizeof(long) || sizeof(i_blocks) > sizeof(long)) spin_lock(&dst->i_lock); i_size_write(dst, i_size); dst->i_blocks = i_blocks; if (sizeof(i_size) > sizeof(long) || sizeof(i_blocks) > sizeof(long)) spin_unlock(&dst->i_lock); } EXPORT_SYMBOL_GPL(fsstack_copy_inode_size); /* copy all attributes */ void fsstack_copy_attr_all(struct inode *dest, const struct inode *src) { dest->i_mode = src->i_mode; dest->i_uid = src->i_uid; dest->i_gid = src->i_gid; dest->i_rdev = src->i_rdev; dest->i_atime = src->i_atime; dest->i_mtime = src->i_mtime; dest->i_ctime = src->i_ctime; dest->i_blkbits = src->i_blkbits; dest->i_flags = src->i_flags; set_nlink(dest, src->i_nlink); } EXPORT_SYMBOL_GPL(fsstack_copy_attr_all); type='search' size='10' name='q' value=''/>
path: root/fs/xfs/libxfs/xfs_rtbitmap.c
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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800
commite7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba (patch)
treef63906f41699c8e38af9d12b063e2ceab0286ef2 /fs/xfs/libxfs/xfs_rtbitmap.c
parente34bac726d27056081d0250c0e173e4b155aa340 (diff)
parent868c97a846a73e937d835b09b8c885a69df50ec8 (diff)
Merge tag 'docs-4.10' of git://git.lwn.net/linuxHEADmaster
Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
Diffstat (limited to 'fs/xfs/libxfs/xfs_rtbitmap.c')